Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_MM_H |
3 | #define _LINUX_MM_H | |
4 | ||
1da177e4 | 5 | #include <linux/errno.h> |
309381fe | 6 | #include <linux/mmdebug.h> |
1da177e4 | 7 | #include <linux/gfp.h> |
d224eb02 | 8 | #include <linux/pgalloc_tag.h> |
187f1882 | 9 | #include <linux/bug.h> |
1da177e4 LT |
10 | #include <linux/list.h> |
11 | #include <linux/mmzone.h> | |
12 | #include <linux/rbtree.h> | |
83aeeada | 13 | #include <linux/atomic.h> |
9a11b49a | 14 | #include <linux/debug_locks.h> |
5b99cd0e | 15 | #include <linux/mm_types.h> |
9740ca4e | 16 | #include <linux/mmap_lock.h> |
08677214 | 17 | #include <linux/range.h> |
c6f6b596 | 18 | #include <linux/pfn.h> |
3565fce3 | 19 | #include <linux/percpu-refcount.h> |
e9da73d6 | 20 | #include <linux/bit_spinlock.h> |
b0d40c92 | 21 | #include <linux/shrinker.h> |
9c599024 | 22 | #include <linux/resource.h> |
e30825f1 | 23 | #include <linux/page_ext.h> |
8025e5dd | 24 | #include <linux/err.h> |
41901567 | 25 | #include <linux/page-flags.h> |
fe896d18 | 26 | #include <linux/page_ref.h> |
3b3b1a29 | 27 | #include <linux/overflow.h> |
b5420237 | 28 | #include <linux/sizes.h> |
7969f226 | 29 | #include <linux/sched.h> |
65fddcfc | 30 | #include <linux/pgtable.h> |
34303244 | 31 | #include <linux/kasan.h> |
f25cbb7a | 32 | #include <linux/memremap.h> |
ef6a22b7 | 33 | #include <linux/slab.h> |
1da177e4 LT |
34 | |
35 | struct mempolicy; | |
36 | struct anon_vma; | |
bf181b9f | 37 | struct anon_vma_chain; |
e8edc6e0 | 38 | struct user_struct; |
bce617ed | 39 | struct pt_regs; |
99fbb6bf | 40 | struct folio_batch; |
1da177e4 | 41 | |
5ef64cc8 LT |
42 | extern int sysctl_page_lock_unfairness; |
43 | ||
b7ec1bf3 | 44 | void mm_core_init(void); |
597b7305 MH |
45 | void init_mm_internals(void); |
46 | ||
a9ee6cf5 | 47 | #ifndef CONFIG_NUMA /* Don't use mapnrs, do it properly */ |
1da177e4 | 48 | extern unsigned long max_mapnr; |
fccc9987 JL |
49 | |
50 | static inline void set_max_mapnr(unsigned long limit) | |
51 | { | |
52 | max_mapnr = limit; | |
53 | } | |
54 | #else | |
55 | static inline void set_max_mapnr(unsigned long limit) { } | |
1da177e4 LT |
56 | #endif |
57 | ||
ca79b0c2 AK |
58 | extern atomic_long_t _totalram_pages; |
59 | static inline unsigned long totalram_pages(void) | |
60 | { | |
61 | return (unsigned long)atomic_long_read(&_totalram_pages); | |
62 | } | |
63 | ||
64 | static inline void totalram_pages_inc(void) | |
65 | { | |
66 | atomic_long_inc(&_totalram_pages); | |
67 | } | |
68 | ||
69 | static inline void totalram_pages_dec(void) | |
70 | { | |
71 | atomic_long_dec(&_totalram_pages); | |
72 | } | |
73 | ||
74 | static inline void totalram_pages_add(long count) | |
75 | { | |
76 | atomic_long_add(count, &_totalram_pages); | |
77 | } | |
78 | ||
1da177e4 | 79 | extern void * high_memory; |
1da177e4 | 80 | extern int page_cluster; |
ea0ffd0c | 81 | extern const int page_cluster_max; |
1da177e4 LT |
82 | |
83 | #ifdef CONFIG_SYSCTL | |
84 | extern int sysctl_legacy_va_layout; | |
85 | #else | |
86 | #define sysctl_legacy_va_layout 0 | |
87 | #endif | |
88 | ||
d07e2259 DC |
89 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS |
90 | extern const int mmap_rnd_bits_min; | |
71a5849a | 91 | extern int mmap_rnd_bits_max __ro_after_init; |
d07e2259 DC |
92 | extern int mmap_rnd_bits __read_mostly; |
93 | #endif | |
94 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS | |
95 | extern const int mmap_rnd_compat_bits_min; | |
96 | extern const int mmap_rnd_compat_bits_max; | |
97 | extern int mmap_rnd_compat_bits __read_mostly; | |
98 | #endif | |
99 | ||
1da177e4 | 100 | #include <asm/page.h> |
1da177e4 | 101 | #include <asm/processor.h> |
1da177e4 | 102 | |
79442ed1 TC |
103 | #ifndef __pa_symbol |
104 | #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) | |
105 | #endif | |
106 | ||
1dff8083 AB |
107 | #ifndef page_to_virt |
108 | #define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x))) | |
109 | #endif | |
110 | ||
568c5fe5 LA |
111 | #ifndef lm_alias |
112 | #define lm_alias(x) __va(__pa_symbol(x)) | |
113 | #endif | |
114 | ||
593befa6 DD |
115 | /* |
116 | * To prevent common memory management code establishing | |
117 | * a zero page mapping on a read fault. | |
118 | * This macro should be defined within <asm/pgtable.h>. | |
119 | * s390 does this to prevent multiplexing of hardware bits | |
120 | * related to the physical page in case of virtualization. | |
121 | */ | |
122 | #ifndef mm_forbids_zeropage | |
123 | #define mm_forbids_zeropage(X) (0) | |
124 | #endif | |
125 | ||
a4a3ede2 PT |
126 | /* |
127 | * On some architectures it is expensive to call memset() for small sizes. | |
5470dea4 AD |
128 | * If an architecture decides to implement their own version of |
129 | * mm_zero_struct_page they should wrap the defines below in a #ifndef and | |
130 | * define their own version of this macro in <asm/pgtable.h> | |
a4a3ede2 | 131 | */ |
5470dea4 | 132 | #if BITS_PER_LONG == 64 |
3770e52f | 133 | /* This function must be updated when the size of struct page grows above 96 |
5470dea4 AD |
134 | * or reduces below 56. The idea that compiler optimizes out switch() |
135 | * statement, and only leaves move/store instructions. Also the compiler can | |
c4ffefd1 | 136 | * combine write statements if they are both assignments and can be reordered, |
5470dea4 AD |
137 | * this can result in several of the writes here being dropped. |
138 | */ | |
139 | #define mm_zero_struct_page(pp) __mm_zero_struct_page(pp) | |
140 | static inline void __mm_zero_struct_page(struct page *page) | |
141 | { | |
142 | unsigned long *_pp = (void *)page; | |
143 | ||
3770e52f | 144 | /* Check that struct page is either 56, 64, 72, 80, 88 or 96 bytes */ |
5470dea4 AD |
145 | BUILD_BUG_ON(sizeof(struct page) & 7); |
146 | BUILD_BUG_ON(sizeof(struct page) < 56); | |
3770e52f | 147 | BUILD_BUG_ON(sizeof(struct page) > 96); |
5470dea4 AD |
148 | |
149 | switch (sizeof(struct page)) { | |
3770e52f AB |
150 | case 96: |
151 | _pp[11] = 0; | |
152 | fallthrough; | |
153 | case 88: | |
154 | _pp[10] = 0; | |
155 | fallthrough; | |
5470dea4 | 156 | case 80: |
df561f66 GS |
157 | _pp[9] = 0; |
158 | fallthrough; | |
5470dea4 | 159 | case 72: |
df561f66 GS |
160 | _pp[8] = 0; |
161 | fallthrough; | |
5470dea4 | 162 | case 64: |
df561f66 GS |
163 | _pp[7] = 0; |
164 | fallthrough; | |
5470dea4 AD |
165 | case 56: |
166 | _pp[6] = 0; | |
167 | _pp[5] = 0; | |
168 | _pp[4] = 0; | |
169 | _pp[3] = 0; | |
170 | _pp[2] = 0; | |
171 | _pp[1] = 0; | |
172 | _pp[0] = 0; | |
173 | } | |
174 | } | |
175 | #else | |
a4a3ede2 PT |
176 | #define mm_zero_struct_page(pp) ((void)memset((pp), 0, sizeof(struct page))) |
177 | #endif | |
178 | ||
ea606cf5 AR |
179 | /* |
180 | * Default maximum number of active map areas, this limits the number of vmas | |
181 | * per mm struct. Users can overwrite this number by sysctl but there is a | |
182 | * problem. | |
183 | * | |
184 | * When a program's coredump is generated as ELF format, a section is created | |
185 | * per a vma. In ELF, the number of sections is represented in unsigned short. | |
186 | * This means the number of sections should be smaller than 65535 at coredump. | |
187 | * Because the kernel adds some informative sections to a image of program at | |
188 | * generating coredump, we need some margin. The number of extra sections is | |
189 | * 1-3 now and depends on arch. We use "5" as safe margin, here. | |
190 | * | |
191 | * ELF extended numbering allows more than 65535 sections, so 16-bit bound is | |
192 | * not a hard limit any more. Although some userspace tools can be surprised by | |
193 | * that. | |
194 | */ | |
195 | #define MAPCOUNT_ELF_CORE_MARGIN (5) | |
196 | #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN) | |
197 | ||
198 | extern int sysctl_max_map_count; | |
199 | ||
c9b1d098 | 200 | extern unsigned long sysctl_user_reserve_kbytes; |
4eeab4f5 | 201 | extern unsigned long sysctl_admin_reserve_kbytes; |
c9b1d098 | 202 | |
49f0ce5f JM |
203 | extern int sysctl_overcommit_memory; |
204 | extern int sysctl_overcommit_ratio; | |
205 | extern unsigned long sysctl_overcommit_kbytes; | |
206 | ||
32927393 CH |
207 | int overcommit_ratio_handler(struct ctl_table *, int, void *, size_t *, |
208 | loff_t *); | |
209 | int overcommit_kbytes_handler(struct ctl_table *, int, void *, size_t *, | |
210 | loff_t *); | |
56f3547b FT |
211 | int overcommit_policy_handler(struct ctl_table *, int, void *, size_t *, |
212 | loff_t *); | |
49f0ce5f | 213 | |
1cfcee72 | 214 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
1da177e4 | 215 | #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) |
659508f9 | 216 | #define folio_page_idx(folio, p) (page_to_pfn(p) - folio_pfn(folio)) |
1cfcee72 MWO |
217 | #else |
218 | #define nth_page(page,n) ((page) + (n)) | |
659508f9 | 219 | #define folio_page_idx(folio, p) ((p) - &(folio)->page) |
1cfcee72 | 220 | #endif |
1da177e4 | 221 | |
27ac792c AR |
222 | /* to align the pointer to the (next) page boundary */ |
223 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) | |
224 | ||
335e52c2 DG |
225 | /* to align the pointer to the (prev) page boundary */ |
226 | #define PAGE_ALIGN_DOWN(addr) ALIGN_DOWN(addr, PAGE_SIZE) | |
227 | ||
0fa73b86 | 228 | /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */ |
1061b0d2 | 229 | #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)(addr), PAGE_SIZE) |
0fa73b86 | 230 | |
06d20bdb MWO |
231 | static inline struct folio *lru_to_folio(struct list_head *head) |
232 | { | |
233 | return list_entry((head)->prev, struct folio, lru); | |
234 | } | |
f86196ea | 235 | |
5748fbc5 KW |
236 | void setup_initial_init_mm(void *start_code, void *end_code, |
237 | void *end_data, void *brk); | |
238 | ||
1da177e4 LT |
239 | /* |
240 | * Linux kernel virtual memory manager primitives. | |
241 | * The idea being to have a "virtual" mm in the same way | |
242 | * we have a virtual fs - giving a cleaner interface to the | |
243 | * mm details, and allowing different kinds of memory mappings | |
244 | * (from shared memory to executable loading to arbitrary | |
245 | * mmap() functions). | |
246 | */ | |
247 | ||
490fc053 | 248 | struct vm_area_struct *vm_area_alloc(struct mm_struct *); |
3928d4f5 LT |
249 | struct vm_area_struct *vm_area_dup(struct vm_area_struct *); |
250 | void vm_area_free(struct vm_area_struct *); | |
0d2ebf9c SB |
251 | /* Use only if VMA has no other users */ |
252 | void __vm_area_free(struct vm_area_struct *vma); | |
c43692e8 | 253 | |
1da177e4 | 254 | #ifndef CONFIG_MMU |
8feae131 DH |
255 | extern struct rb_root nommu_region_tree; |
256 | extern struct rw_semaphore nommu_region_sem; | |
1da177e4 LT |
257 | |
258 | extern unsigned int kobjsize(const void *objp); | |
259 | #endif | |
260 | ||
261 | /* | |
605d9288 | 262 | * vm_flags in vm_area_struct, see mm_types.h. |
bcf66917 | 263 | * When changing, update also include/trace/events/mmflags.h |
1da177e4 | 264 | */ |
cc2383ec KK |
265 | #define VM_NONE 0x00000000 |
266 | ||
1da177e4 LT |
267 | #define VM_READ 0x00000001 /* currently active flags */ |
268 | #define VM_WRITE 0x00000002 | |
269 | #define VM_EXEC 0x00000004 | |
270 | #define VM_SHARED 0x00000008 | |
271 | ||
7e2cff42 | 272 | /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */ |
1da177e4 LT |
273 | #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ |
274 | #define VM_MAYWRITE 0x00000020 | |
275 | #define VM_MAYEXEC 0x00000040 | |
276 | #define VM_MAYSHARE 0x00000080 | |
277 | ||
278 | #define VM_GROWSDOWN 0x00000100 /* general info on the segment */ | |
b6b7a8fa | 279 | #ifdef CONFIG_MMU |
16ba6f81 | 280 | #define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */ |
b6b7a8fa DH |
281 | #else /* CONFIG_MMU */ |
282 | #define VM_MAYOVERLAY 0x00000200 /* nommu: R/O MAP_PRIVATE mapping that might overlay a file mapping */ | |
283 | #define VM_UFFD_MISSING 0 | |
284 | #endif /* CONFIG_MMU */ | |
6aab341e | 285 | #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */ |
16ba6f81 | 286 | #define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */ |
1da177e4 | 287 | |
1da177e4 LT |
288 | #define VM_LOCKED 0x00002000 |
289 | #define VM_IO 0x00004000 /* Memory mapped I/O or similar */ | |
290 | ||
291 | /* Used by sys_madvise() */ | |
292 | #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ | |
293 | #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ | |
294 | ||
295 | #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ | |
296 | #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ | |
de60f5f1 | 297 | #define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */ |
1da177e4 | 298 | #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ |
cdfd4325 | 299 | #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ |
1da177e4 | 300 | #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ |
b6fb293f | 301 | #define VM_SYNC 0x00800000 /* Synchronous page faults */ |
cc2383ec | 302 | #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */ |
d2cd9ede | 303 | #define VM_WIPEONFORK 0x02000000 /* Wipe VMA contents in child. */ |
0103bd16 | 304 | #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */ |
d00806b1 | 305 | |
d9104d1c CG |
306 | #ifdef CONFIG_MEM_SOFT_DIRTY |
307 | # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */ | |
308 | #else | |
309 | # define VM_SOFTDIRTY 0 | |
310 | #endif | |
311 | ||
b379d790 | 312 | #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */ |
cc2383ec KK |
313 | #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */ |
314 | #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */ | |
f8af4da3 | 315 | #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */ |
1da177e4 | 316 | |
63c17fb8 DH |
317 | #ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS |
318 | #define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */ | |
319 | #define VM_HIGH_ARCH_BIT_1 33 /* bit only usable on 64-bit architectures */ | |
320 | #define VM_HIGH_ARCH_BIT_2 34 /* bit only usable on 64-bit architectures */ | |
321 | #define VM_HIGH_ARCH_BIT_3 35 /* bit only usable on 64-bit architectures */ | |
df3735c5 | 322 | #define VM_HIGH_ARCH_BIT_4 36 /* bit only usable on 64-bit architectures */ |
54007f81 | 323 | #define VM_HIGH_ARCH_BIT_5 37 /* bit only usable on 64-bit architectures */ |
63c17fb8 DH |
324 | #define VM_HIGH_ARCH_0 BIT(VM_HIGH_ARCH_BIT_0) |
325 | #define VM_HIGH_ARCH_1 BIT(VM_HIGH_ARCH_BIT_1) | |
326 | #define VM_HIGH_ARCH_2 BIT(VM_HIGH_ARCH_BIT_2) | |
327 | #define VM_HIGH_ARCH_3 BIT(VM_HIGH_ARCH_BIT_3) | |
df3735c5 | 328 | #define VM_HIGH_ARCH_4 BIT(VM_HIGH_ARCH_BIT_4) |
54007f81 | 329 | #define VM_HIGH_ARCH_5 BIT(VM_HIGH_ARCH_BIT_5) |
63c17fb8 DH |
330 | #endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */ |
331 | ||
5212213a | 332 | #ifdef CONFIG_ARCH_HAS_PKEYS |
8f62c883 DH |
333 | # define VM_PKEY_SHIFT VM_HIGH_ARCH_BIT_0 |
334 | # define VM_PKEY_BIT0 VM_HIGH_ARCH_0 /* A protection key is a 4-bit value */ | |
2c9e0a6f | 335 | # define VM_PKEY_BIT1 VM_HIGH_ARCH_1 /* on x86 and 5-bit value on ppc64 */ |
8f62c883 DH |
336 | # define VM_PKEY_BIT2 VM_HIGH_ARCH_2 |
337 | # define VM_PKEY_BIT3 VM_HIGH_ARCH_3 | |
2c9e0a6f RP |
338 | #ifdef CONFIG_PPC |
339 | # define VM_PKEY_BIT4 VM_HIGH_ARCH_4 | |
340 | #else | |
341 | # define VM_PKEY_BIT4 0 | |
8f62c883 | 342 | #endif |
5212213a RP |
343 | #endif /* CONFIG_ARCH_HAS_PKEYS */ |
344 | ||
54007f81 | 345 | #ifdef CONFIG_X86_USER_SHADOW_STACK |
0266e7c5 | 346 | /* |
87f0df78 RE |
347 | * VM_SHADOW_STACK should not be set with VM_SHARED because of lack of |
348 | * support core mm. | |
0266e7c5 | 349 | * |
87f0df78 RE |
350 | * These VMAs will get a single end guard page. This helps userspace protect |
351 | * itself from attacks. A single page is enough for current shadow stack archs | |
352 | * (x86). See the comments near alloc_shstk() in arch/x86/kernel/shstk.c | |
353 | * for more details on the guard size. | |
0266e7c5 RE |
354 | */ |
355 | # define VM_SHADOW_STACK VM_HIGH_ARCH_5 | |
54007f81 YY |
356 | #else |
357 | # define VM_SHADOW_STACK VM_NONE | |
358 | #endif | |
359 | ||
5212213a RP |
360 | #if defined(CONFIG_X86) |
361 | # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */ | |
12564485 SA |
362 | #elif defined(CONFIG_PPC) |
363 | # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */ | |
cc2383ec KK |
364 | #elif defined(CONFIG_PARISC) |
365 | # define VM_GROWSUP VM_ARCH_1 | |
74a04967 KA |
366 | #elif defined(CONFIG_SPARC64) |
367 | # define VM_SPARC_ADI VM_ARCH_1 /* Uses ADI tag for access control */ | |
368 | # define VM_ARCH_CLEAR VM_SPARC_ADI | |
8ef8f360 DM |
369 | #elif defined(CONFIG_ARM64) |
370 | # define VM_ARM64_BTI VM_ARCH_1 /* BTI guarded page, a.k.a. GP bit */ | |
371 | # define VM_ARCH_CLEAR VM_ARM64_BTI | |
cc2383ec KK |
372 | #elif !defined(CONFIG_MMU) |
373 | # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */ | |
374 | #endif | |
375 | ||
9f341931 CM |
376 | #if defined(CONFIG_ARM64_MTE) |
377 | # define VM_MTE VM_HIGH_ARCH_0 /* Use Tagged memory for access control */ | |
378 | # define VM_MTE_ALLOWED VM_HIGH_ARCH_1 /* Tagged memory permitted */ | |
379 | #else | |
380 | # define VM_MTE VM_NONE | |
381 | # define VM_MTE_ALLOWED VM_NONE | |
382 | #endif | |
383 | ||
cc2383ec KK |
384 | #ifndef VM_GROWSUP |
385 | # define VM_GROWSUP VM_NONE | |
386 | #endif | |
387 | ||
7677f7fd | 388 | #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR |
fb47a799 | 389 | # define VM_UFFD_MINOR_BIT 38 |
7677f7fd AR |
390 | # define VM_UFFD_MINOR BIT(VM_UFFD_MINOR_BIT) /* UFFD minor faults */ |
391 | #else /* !CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */ | |
392 | # define VM_UFFD_MINOR VM_NONE | |
393 | #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */ | |
394 | ||
5c656fcd AA |
395 | /* |
396 | * This flag is used to connect VFIO to arch specific KVM code. It | |
397 | * indicates that the memory under this VMA is safe for use with any | |
398 | * non-cachable memory type inside KVM. Some VFIO devices, on some | |
399 | * platforms, are thought to be unsafe and can cause machine crashes | |
400 | * if KVM does not lock down the memory type. | |
401 | */ | |
402 | #ifdef CONFIG_64BIT | |
403 | #define VM_ALLOW_ANY_UNCACHED_BIT 39 | |
404 | #define VM_ALLOW_ANY_UNCACHED BIT(VM_ALLOW_ANY_UNCACHED_BIT) | |
405 | #else | |
406 | #define VM_ALLOW_ANY_UNCACHED VM_NONE | |
407 | #endif | |
408 | ||
a8bef8ff | 409 | /* Bits set in the VMA until the stack is in its final location */ |
f66066bc | 410 | #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ | VM_STACK_EARLY) |
a8bef8ff | 411 | |
c62da0c3 AK |
412 | #define TASK_EXEC ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) |
413 | ||
414 | /* Common data flag combinations */ | |
415 | #define VM_DATA_FLAGS_TSK_EXEC (VM_READ | VM_WRITE | TASK_EXEC | \ | |
416 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
417 | #define VM_DATA_FLAGS_NON_EXEC (VM_READ | VM_WRITE | VM_MAYREAD | \ | |
418 | VM_MAYWRITE | VM_MAYEXEC) | |
419 | #define VM_DATA_FLAGS_EXEC (VM_READ | VM_WRITE | VM_EXEC | \ | |
420 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
421 | ||
422 | #ifndef VM_DATA_DEFAULT_FLAGS /* arch can override this */ | |
423 | #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_EXEC | |
424 | #endif | |
425 | ||
1da177e4 LT |
426 | #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ |
427 | #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS | |
428 | #endif | |
429 | ||
0266e7c5 RE |
430 | #define VM_STARTGAP_FLAGS (VM_GROWSDOWN | VM_SHADOW_STACK) |
431 | ||
1da177e4 | 432 | #ifdef CONFIG_STACK_GROWSUP |
30bdbb78 | 433 | #define VM_STACK VM_GROWSUP |
f66066bc | 434 | #define VM_STACK_EARLY VM_GROWSDOWN |
1da177e4 | 435 | #else |
30bdbb78 | 436 | #define VM_STACK VM_GROWSDOWN |
f66066bc | 437 | #define VM_STACK_EARLY 0 |
1da177e4 LT |
438 | #endif |
439 | ||
30bdbb78 KK |
440 | #define VM_STACK_FLAGS (VM_STACK | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) |
441 | ||
6cb4d9a2 AK |
442 | /* VMA basic access permission flags */ |
443 | #define VM_ACCESS_FLAGS (VM_READ | VM_WRITE | VM_EXEC) | |
444 | ||
445 | ||
b291f000 | 446 | /* |
78f11a25 | 447 | * Special vmas that are non-mergable, non-mlock()able. |
b291f000 | 448 | */ |
9050d7eb | 449 | #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP) |
b291f000 | 450 | |
b4443772 AK |
451 | /* This mask prevents VMA from being scanned with khugepaged */ |
452 | #define VM_NO_KHUGEPAGED (VM_SPECIAL | VM_HUGETLB) | |
453 | ||
a0715cc2 AT |
454 | /* This mask defines which mm->def_flags a process can inherit its parent */ |
455 | #define VM_INIT_DEF_MASK VM_NOHUGEPAGE | |
456 | ||
e430a95a SB |
457 | /* This mask represents all the VMA flag bits used by mlock */ |
458 | #define VM_LOCKED_MASK (VM_LOCKED | VM_LOCKONFAULT) | |
de60f5f1 | 459 | |
2c2d57b5 KA |
460 | /* Arch-specific flags to clear when updating VM flags on protection change */ |
461 | #ifndef VM_ARCH_CLEAR | |
462 | # define VM_ARCH_CLEAR VM_NONE | |
463 | #endif | |
464 | #define VM_FLAGS_CLEAR (ARCH_VM_PKEY_FLAGS | VM_ARCH_CLEAR) | |
465 | ||
1da177e4 LT |
466 | /* |
467 | * mapping from the currently active vm_flags protection bits (the | |
468 | * low four bits) to a page protection mask.. | |
469 | */ | |
1da177e4 | 470 | |
dde16072 PX |
471 | /* |
472 | * The default fault flags that should be used by most of the | |
473 | * arch-specific page fault handlers. | |
474 | */ | |
475 | #define FAULT_FLAG_DEFAULT (FAULT_FLAG_ALLOW_RETRY | \ | |
c270a7ee PX |
476 | FAULT_FLAG_KILLABLE | \ |
477 | FAULT_FLAG_INTERRUPTIBLE) | |
dde16072 | 478 | |
4064b982 PX |
479 | /** |
480 | * fault_flag_allow_retry_first - check ALLOW_RETRY the first time | |
78f4841e | 481 | * @flags: Fault flags. |
4064b982 PX |
482 | * |
483 | * This is mostly used for places where we want to try to avoid taking | |
c1e8d7c6 | 484 | * the mmap_lock for too long a time when waiting for another condition |
4064b982 | 485 | * to change, in which case we can try to be polite to release the |
c1e8d7c6 ML |
486 | * mmap_lock in the first round to avoid potential starvation of other |
487 | * processes that would also want the mmap_lock. | |
4064b982 PX |
488 | * |
489 | * Return: true if the page fault allows retry and this is the first | |
490 | * attempt of the fault handling; false otherwise. | |
491 | */ | |
da2f5eb3 | 492 | static inline bool fault_flag_allow_retry_first(enum fault_flag flags) |
4064b982 PX |
493 | { |
494 | return (flags & FAULT_FLAG_ALLOW_RETRY) && | |
495 | (!(flags & FAULT_FLAG_TRIED)); | |
496 | } | |
497 | ||
282a8e03 RZ |
498 | #define FAULT_FLAG_TRACE \ |
499 | { FAULT_FLAG_WRITE, "WRITE" }, \ | |
500 | { FAULT_FLAG_MKWRITE, "MKWRITE" }, \ | |
501 | { FAULT_FLAG_ALLOW_RETRY, "ALLOW_RETRY" }, \ | |
502 | { FAULT_FLAG_RETRY_NOWAIT, "RETRY_NOWAIT" }, \ | |
503 | { FAULT_FLAG_KILLABLE, "KILLABLE" }, \ | |
504 | { FAULT_FLAG_TRIED, "TRIED" }, \ | |
505 | { FAULT_FLAG_USER, "USER" }, \ | |
506 | { FAULT_FLAG_REMOTE, "REMOTE" }, \ | |
c270a7ee | 507 | { FAULT_FLAG_INSTRUCTION, "INSTRUCTION" }, \ |
55324e46 SB |
508 | { FAULT_FLAG_INTERRUPTIBLE, "INTERRUPTIBLE" }, \ |
509 | { FAULT_FLAG_VMA_LOCK, "VMA_LOCK" } | |
282a8e03 | 510 | |
54cb8821 | 511 | /* |
11192337 | 512 | * vm_fault is filled by the pagefault handler and passed to the vma's |
83c54070 NP |
513 | * ->fault function. The vma's ->fault is responsible for returning a bitmask |
514 | * of VM_FAULT_xxx flags that give details about how the fault was handled. | |
54cb8821 | 515 | * |
c20cd45e MH |
516 | * MM layer fills up gfp_mask for page allocations but fault handler might |
517 | * alter it if its implementation requires a different allocation context. | |
518 | * | |
9b4bdd2f | 519 | * pgoff should be used in favour of virtual_address, if possible. |
54cb8821 | 520 | */ |
d0217ac0 | 521 | struct vm_fault { |
5857c920 | 522 | const struct { |
742d3372 WD |
523 | struct vm_area_struct *vma; /* Target VMA */ |
524 | gfp_t gfp_mask; /* gfp mask to be used for allocations */ | |
525 | pgoff_t pgoff; /* Logical page offset based on vma */ | |
824ddc60 NA |
526 | unsigned long address; /* Faulting virtual address - masked */ |
527 | unsigned long real_address; /* Faulting virtual address - unmasked */ | |
742d3372 | 528 | }; |
da2f5eb3 | 529 | enum fault_flag flags; /* FAULT_FLAG_xxx flags |
742d3372 | 530 | * XXX: should really be 'const' */ |
82b0f8c3 | 531 | pmd_t *pmd; /* Pointer to pmd entry matching |
2994302b | 532 | * the 'address' */ |
a2d58167 DJ |
533 | pud_t *pud; /* Pointer to pud entry matching |
534 | * the 'address' | |
535 | */ | |
5db4f15c YS |
536 | union { |
537 | pte_t orig_pte; /* Value of PTE at the time of fault */ | |
538 | pmd_t orig_pmd; /* Value of PMD at the time of fault, | |
539 | * used by PMD fault only. | |
540 | */ | |
541 | }; | |
d0217ac0 | 542 | |
3917048d | 543 | struct page *cow_page; /* Page handler may use for COW fault */ |
d0217ac0 | 544 | struct page *page; /* ->fault handlers should return a |
83c54070 | 545 | * page here, unless VM_FAULT_NOPAGE |
d0217ac0 | 546 | * is set (which is also implied by |
83c54070 | 547 | * VM_FAULT_ERROR). |
d0217ac0 | 548 | */ |
82b0f8c3 | 549 | /* These three entries are valid only while holding ptl lock */ |
bae473a4 KS |
550 | pte_t *pte; /* Pointer to pte entry matching |
551 | * the 'address'. NULL if the page | |
552 | * table hasn't been allocated. | |
553 | */ | |
554 | spinlock_t *ptl; /* Page table lock. | |
555 | * Protects pte page table if 'pte' | |
556 | * is not NULL, otherwise pmd. | |
557 | */ | |
7267ec00 | 558 | pgtable_t prealloc_pte; /* Pre-allocated pte page table. |
f9ce0be7 KS |
559 | * vm_ops->map_pages() sets up a page |
560 | * table from atomic context. | |
7267ec00 KS |
561 | * do_fault_around() pre-allocates |
562 | * page table to avoid allocation from | |
563 | * atomic context. | |
564 | */ | |
54cb8821 | 565 | }; |
1da177e4 LT |
566 | |
567 | /* | |
568 | * These are the virtual MM functions - opening of an area, closing and | |
569 | * unmapping it (needed to keep files on disk up-to-date etc), pointer | |
27d036e3 | 570 | * to the functions called when a no-page or a wp-page exception occurs. |
1da177e4 LT |
571 | */ |
572 | struct vm_operations_struct { | |
573 | void (*open)(struct vm_area_struct * area); | |
cc6dcfee SB |
574 | /** |
575 | * @close: Called when the VMA is being removed from the MM. | |
576 | * Context: User context. May sleep. Caller holds mmap_lock. | |
577 | */ | |
1da177e4 | 578 | void (*close)(struct vm_area_struct * area); |
dd3b614f DS |
579 | /* Called any time before splitting to check if it's allowed */ |
580 | int (*may_split)(struct vm_area_struct *area, unsigned long addr); | |
14d07113 | 581 | int (*mremap)(struct vm_area_struct *area); |
95bb7c42 SC |
582 | /* |
583 | * Called by mprotect() to make driver-specific permission | |
584 | * checks before mprotect() is finalised. The VMA must not | |
3e0ee843 | 585 | * be modified. Returns 0 if mprotect() can proceed. |
95bb7c42 SC |
586 | */ |
587 | int (*mprotect)(struct vm_area_struct *vma, unsigned long start, | |
588 | unsigned long end, unsigned long newflags); | |
1c8f4220 | 589 | vm_fault_t (*fault)(struct vm_fault *vmf); |
1d024e7a | 590 | vm_fault_t (*huge_fault)(struct vm_fault *vmf, unsigned int order); |
f9ce0be7 | 591 | vm_fault_t (*map_pages)(struct vm_fault *vmf, |
bae473a4 | 592 | pgoff_t start_pgoff, pgoff_t end_pgoff); |
05ea8860 | 593 | unsigned long (*pagesize)(struct vm_area_struct * area); |
9637a5ef DH |
594 | |
595 | /* notification that a previously read-only page is about to become | |
596 | * writable, if an error is returned it will cause a SIGBUS */ | |
1c8f4220 | 597 | vm_fault_t (*page_mkwrite)(struct vm_fault *vmf); |
28b2ee20 | 598 | |
dd906184 | 599 | /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */ |
1c8f4220 | 600 | vm_fault_t (*pfn_mkwrite)(struct vm_fault *vmf); |
dd906184 | 601 | |
28b2ee20 | 602 | /* called by access_process_vm when get_user_pages() fails, typically |
96667f8a DV |
603 | * for use by special VMAs. See also generic_access_phys() for a generic |
604 | * implementation useful for any iomem mapping. | |
28b2ee20 RR |
605 | */ |
606 | int (*access)(struct vm_area_struct *vma, unsigned long addr, | |
607 | void *buf, int len, int write); | |
78d683e8 AL |
608 | |
609 | /* Called by the /proc/PID/maps code to ask the vma whether it | |
610 | * has a special name. Returning non-NULL will also cause this | |
611 | * vma to be dumped unconditionally. */ | |
612 | const char *(*name)(struct vm_area_struct *vma); | |
613 | ||
1da177e4 | 614 | #ifdef CONFIG_NUMA |
a6020ed7 LS |
615 | /* |
616 | * set_policy() op must add a reference to any non-NULL @new mempolicy | |
617 | * to hold the policy upon return. Caller should pass NULL @new to | |
618 | * remove a policy and fall back to surrounding context--i.e. do not | |
619 | * install a MPOL_DEFAULT policy, nor the task or system default | |
620 | * mempolicy. | |
621 | */ | |
1da177e4 | 622 | int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); |
a6020ed7 LS |
623 | |
624 | /* | |
625 | * get_policy() op must add reference [mpol_get()] to any policy at | |
626 | * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure | |
627 | * in mm/mempolicy.c will do this automatically. | |
628 | * get_policy() must NOT add a ref if the policy at (vma,addr) is not | |
c1e8d7c6 | 629 | * marked as MPOL_SHARED. vma policies are protected by the mmap_lock. |
a6020ed7 LS |
630 | * If no [shared/vma] mempolicy exists at the addr, get_policy() op |
631 | * must return NULL--i.e., do not "fallback" to task or system default | |
632 | * policy. | |
633 | */ | |
1da177e4 | 634 | struct mempolicy *(*get_policy)(struct vm_area_struct *vma, |
ddc1a5cb | 635 | unsigned long addr, pgoff_t *ilx); |
1da177e4 | 636 | #endif |
667a0a06 DV |
637 | /* |
638 | * Called by vm_normal_page() for special PTEs to find the | |
639 | * page for @addr. This is useful if the default behavior | |
640 | * (using pte_page()) would not find the correct page. | |
641 | */ | |
642 | struct page *(*find_special_page)(struct vm_area_struct *vma, | |
643 | unsigned long addr); | |
1da177e4 LT |
644 | }; |
645 | ||
ef6a22b7 MG |
646 | #ifdef CONFIG_NUMA_BALANCING |
647 | static inline void vma_numab_state_init(struct vm_area_struct *vma) | |
648 | { | |
649 | vma->numab_state = NULL; | |
650 | } | |
651 | static inline void vma_numab_state_free(struct vm_area_struct *vma) | |
652 | { | |
653 | kfree(vma->numab_state); | |
654 | } | |
655 | #else | |
656 | static inline void vma_numab_state_init(struct vm_area_struct *vma) {} | |
657 | static inline void vma_numab_state_free(struct vm_area_struct *vma) {} | |
658 | #endif /* CONFIG_NUMA_BALANCING */ | |
659 | ||
5e31275c | 660 | #ifdef CONFIG_PER_VMA_LOCK |
5e31275c SB |
661 | /* |
662 | * Try to read-lock a vma. The function is allowed to occasionally yield false | |
663 | * locked result to avoid performance overhead, in which case we fall back to | |
664 | * using mmap_lock. The function should never yield false unlocked result. | |
665 | */ | |
666 | static inline bool vma_start_read(struct vm_area_struct *vma) | |
667 | { | |
b1f02b95 JH |
668 | /* |
669 | * Check before locking. A race might cause false locked result. | |
670 | * We can use READ_ONCE() for the mm_lock_seq here, and don't need | |
671 | * ACQUIRE semantics, because this is just a lockless check whose result | |
672 | * we don't rely on for anything - the mm_lock_seq read against which we | |
673 | * need ordering is below. | |
674 | */ | |
675 | if (READ_ONCE(vma->vm_lock_seq) == READ_ONCE(vma->vm_mm->mm_lock_seq)) | |
5e31275c SB |
676 | return false; |
677 | ||
c7f8f31c | 678 | if (unlikely(down_read_trylock(&vma->vm_lock->lock) == 0)) |
5e31275c SB |
679 | return false; |
680 | ||
681 | /* | |
682 | * Overflow might produce false locked result. | |
683 | * False unlocked result is impossible because we modify and check | |
c7f8f31c | 684 | * vma->vm_lock_seq under vma->vm_lock protection and mm->mm_lock_seq |
5e31275c | 685 | * modification invalidates all existing locks. |
b1f02b95 JH |
686 | * |
687 | * We must use ACQUIRE semantics for the mm_lock_seq so that if we are | |
688 | * racing with vma_end_write_all(), we only start reading from the VMA | |
689 | * after it has been unlocked. | |
690 | * This pairs with RELEASE semantics in vma_end_write_all(). | |
5e31275c | 691 | */ |
b1f02b95 | 692 | if (unlikely(vma->vm_lock_seq == smp_load_acquire(&vma->vm_mm->mm_lock_seq))) { |
c7f8f31c | 693 | up_read(&vma->vm_lock->lock); |
5e31275c SB |
694 | return false; |
695 | } | |
696 | return true; | |
697 | } | |
698 | ||
699 | static inline void vma_end_read(struct vm_area_struct *vma) | |
700 | { | |
701 | rcu_read_lock(); /* keeps vma alive till the end of up_read */ | |
c7f8f31c | 702 | up_read(&vma->vm_lock->lock); |
5e31275c SB |
703 | rcu_read_unlock(); |
704 | } | |
705 | ||
29a22b9e | 706 | /* WARNING! Can only be used if mmap_lock is expected to be write-locked */ |
55fd6fcc | 707 | static bool __is_vma_write_locked(struct vm_area_struct *vma, int *mm_lock_seq) |
5e31275c | 708 | { |
5e31275c SB |
709 | mmap_assert_write_locked(vma->vm_mm); |
710 | ||
711 | /* | |
712 | * current task is holding mmap_write_lock, both vma->vm_lock_seq and | |
713 | * mm->mm_lock_seq can't be concurrently modified. | |
714 | */ | |
b1f02b95 | 715 | *mm_lock_seq = vma->vm_mm->mm_lock_seq; |
55fd6fcc SB |
716 | return (vma->vm_lock_seq == *mm_lock_seq); |
717 | } | |
718 | ||
90717566 JH |
719 | /* |
720 | * Begin writing to a VMA. | |
721 | * Exclude concurrent readers under the per-VMA lock until the currently | |
722 | * write-locked mmap_lock is dropped or downgraded. | |
723 | */ | |
55fd6fcc SB |
724 | static inline void vma_start_write(struct vm_area_struct *vma) |
725 | { | |
726 | int mm_lock_seq; | |
727 | ||
728 | if (__is_vma_write_locked(vma, &mm_lock_seq)) | |
5e31275c SB |
729 | return; |
730 | ||
c7f8f31c | 731 | down_write(&vma->vm_lock->lock); |
b1f02b95 JH |
732 | /* |
733 | * We should use WRITE_ONCE() here because we can have concurrent reads | |
734 | * from the early lockless pessimistic check in vma_start_read(). | |
735 | * We don't really care about the correctness of that early check, but | |
736 | * we should use WRITE_ONCE() for cleanliness and to keep KCSAN happy. | |
737 | */ | |
738 | WRITE_ONCE(vma->vm_lock_seq, mm_lock_seq); | |
c7f8f31c | 739 | up_write(&vma->vm_lock->lock); |
5e31275c SB |
740 | } |
741 | ||
742 | static inline void vma_assert_write_locked(struct vm_area_struct *vma) | |
743 | { | |
55fd6fcc SB |
744 | int mm_lock_seq; |
745 | ||
746 | VM_BUG_ON_VMA(!__is_vma_write_locked(vma, &mm_lock_seq), vma); | |
5e31275c SB |
747 | } |
748 | ||
29a22b9e SB |
749 | static inline void vma_assert_locked(struct vm_area_struct *vma) |
750 | { | |
751 | if (!rwsem_is_locked(&vma->vm_lock->lock)) | |
752 | vma_assert_write_locked(vma); | |
753 | } | |
754 | ||
457f67be SB |
755 | static inline void vma_mark_detached(struct vm_area_struct *vma, bool detached) |
756 | { | |
757 | /* When detaching vma should be write-locked */ | |
758 | if (detached) | |
759 | vma_assert_write_locked(vma); | |
760 | vma->detached = detached; | |
761 | } | |
762 | ||
1235ccd0 SB |
763 | static inline void release_fault_lock(struct vm_fault *vmf) |
764 | { | |
765 | if (vmf->flags & FAULT_FLAG_VMA_LOCK) | |
766 | vma_end_read(vmf->vma); | |
767 | else | |
768 | mmap_read_unlock(vmf->vma->vm_mm); | |
769 | } | |
770 | ||
29a22b9e SB |
771 | static inline void assert_fault_locked(struct vm_fault *vmf) |
772 | { | |
773 | if (vmf->flags & FAULT_FLAG_VMA_LOCK) | |
774 | vma_assert_locked(vmf->vma); | |
775 | else | |
776 | mmap_assert_locked(vmf->vma->vm_mm); | |
777 | } | |
778 | ||
50ee3253 SB |
779 | struct vm_area_struct *lock_vma_under_rcu(struct mm_struct *mm, |
780 | unsigned long address); | |
781 | ||
5e31275c SB |
782 | #else /* CONFIG_PER_VMA_LOCK */ |
783 | ||
5e31275c SB |
784 | static inline bool vma_start_read(struct vm_area_struct *vma) |
785 | { return false; } | |
786 | static inline void vma_end_read(struct vm_area_struct *vma) {} | |
787 | static inline void vma_start_write(struct vm_area_struct *vma) {} | |
ce2fc5ff SB |
788 | static inline void vma_assert_write_locked(struct vm_area_struct *vma) |
789 | { mmap_assert_write_locked(vma->vm_mm); } | |
457f67be SB |
790 | static inline void vma_mark_detached(struct vm_area_struct *vma, |
791 | bool detached) {} | |
5e31275c | 792 | |
284e0592 MWO |
793 | static inline struct vm_area_struct *lock_vma_under_rcu(struct mm_struct *mm, |
794 | unsigned long address) | |
795 | { | |
796 | return NULL; | |
797 | } | |
798 | ||
32af81af LG |
799 | static inline void vma_assert_locked(struct vm_area_struct *vma) |
800 | { | |
801 | mmap_assert_locked(vma->vm_mm); | |
802 | } | |
803 | ||
1235ccd0 SB |
804 | static inline void release_fault_lock(struct vm_fault *vmf) |
805 | { | |
806 | mmap_read_unlock(vmf->vma->vm_mm); | |
807 | } | |
808 | ||
29a22b9e SB |
809 | static inline void assert_fault_locked(struct vm_fault *vmf) |
810 | { | |
811 | mmap_assert_locked(vmf->vma->vm_mm); | |
812 | } | |
813 | ||
5e31275c SB |
814 | #endif /* CONFIG_PER_VMA_LOCK */ |
815 | ||
9a9d0b82 MG |
816 | extern const struct vm_operations_struct vma_dummy_vm_ops; |
817 | ||
c7f8f31c SB |
818 | /* |
819 | * WARNING: vma_init does not initialize vma->vm_lock. | |
820 | * Use vm_area_alloc()/vm_area_free() if vma needs locking. | |
821 | */ | |
027232da KS |
822 | static inline void vma_init(struct vm_area_struct *vma, struct mm_struct *mm) |
823 | { | |
a670468f | 824 | memset(vma, 0, sizeof(*vma)); |
027232da | 825 | vma->vm_mm = mm; |
9a9d0b82 | 826 | vma->vm_ops = &vma_dummy_vm_ops; |
027232da | 827 | INIT_LIST_HEAD(&vma->anon_vma_chain); |
457f67be | 828 | vma_mark_detached(vma, false); |
ef6a22b7 | 829 | vma_numab_state_init(vma); |
027232da KS |
830 | } |
831 | ||
bc292ab0 SB |
832 | /* Use when VMA is not part of the VMA tree and needs no locking */ |
833 | static inline void vm_flags_init(struct vm_area_struct *vma, | |
834 | vm_flags_t flags) | |
835 | { | |
836 | ACCESS_PRIVATE(vma, __vm_flags) = flags; | |
837 | } | |
838 | ||
60081bf1 SB |
839 | /* |
840 | * Use when VMA is part of the VMA tree and modifications need coordination | |
841 | * Note: vm_flags_reset and vm_flags_reset_once do not lock the vma and | |
842 | * it should be locked explicitly beforehand. | |
843 | */ | |
bc292ab0 SB |
844 | static inline void vm_flags_reset(struct vm_area_struct *vma, |
845 | vm_flags_t flags) | |
846 | { | |
60081bf1 | 847 | vma_assert_write_locked(vma); |
bc292ab0 SB |
848 | vm_flags_init(vma, flags); |
849 | } | |
850 | ||
601c3c29 SB |
851 | static inline void vm_flags_reset_once(struct vm_area_struct *vma, |
852 | vm_flags_t flags) | |
853 | { | |
60081bf1 | 854 | vma_assert_write_locked(vma); |
601c3c29 SB |
855 | WRITE_ONCE(ACCESS_PRIVATE(vma, __vm_flags), flags); |
856 | } | |
857 | ||
bc292ab0 SB |
858 | static inline void vm_flags_set(struct vm_area_struct *vma, |
859 | vm_flags_t flags) | |
860 | { | |
c7322933 | 861 | vma_start_write(vma); |
bc292ab0 SB |
862 | ACCESS_PRIVATE(vma, __vm_flags) |= flags; |
863 | } | |
864 | ||
865 | static inline void vm_flags_clear(struct vm_area_struct *vma, | |
866 | vm_flags_t flags) | |
867 | { | |
c7322933 | 868 | vma_start_write(vma); |
bc292ab0 SB |
869 | ACCESS_PRIVATE(vma, __vm_flags) &= ~flags; |
870 | } | |
871 | ||
68f48381 SB |
872 | /* |
873 | * Use only if VMA is not part of the VMA tree or has no other users and | |
874 | * therefore needs no locking. | |
875 | */ | |
876 | static inline void __vm_flags_mod(struct vm_area_struct *vma, | |
877 | vm_flags_t set, vm_flags_t clear) | |
878 | { | |
879 | vm_flags_init(vma, (vma->vm_flags | set) & ~clear); | |
880 | } | |
881 | ||
bc292ab0 SB |
882 | /* |
883 | * Use only when the order of set/clear operations is unimportant, otherwise | |
884 | * use vm_flags_{set|clear} explicitly. | |
885 | */ | |
886 | static inline void vm_flags_mod(struct vm_area_struct *vma, | |
887 | vm_flags_t set, vm_flags_t clear) | |
888 | { | |
c7322933 | 889 | vma_start_write(vma); |
68f48381 | 890 | __vm_flags_mod(vma, set, clear); |
bc292ab0 SB |
891 | } |
892 | ||
bfd40eaf KS |
893 | static inline void vma_set_anonymous(struct vm_area_struct *vma) |
894 | { | |
895 | vma->vm_ops = NULL; | |
896 | } | |
897 | ||
43675e6f YS |
898 | static inline bool vma_is_anonymous(struct vm_area_struct *vma) |
899 | { | |
900 | return !vma->vm_ops; | |
901 | } | |
902 | ||
11250fd1 KW |
903 | /* |
904 | * Indicate if the VMA is a heap for the given task; for | |
905 | * /proc/PID/maps that is the heap of the main task. | |
906 | */ | |
907 | static inline bool vma_is_initial_heap(const struct vm_area_struct *vma) | |
908 | { | |
d3bb89ea KW |
909 | return vma->vm_start < vma->vm_mm->brk && |
910 | vma->vm_end > vma->vm_mm->start_brk; | |
11250fd1 KW |
911 | } |
912 | ||
913 | /* | |
914 | * Indicate if the VMA is a stack for the given task; for | |
915 | * /proc/PID/maps that is the stack of the main task. | |
916 | */ | |
917 | static inline bool vma_is_initial_stack(const struct vm_area_struct *vma) | |
918 | { | |
919 | /* | |
920 | * We make no effort to guess what a given thread considers to be | |
921 | * its "stack". It's not even well-defined for programs written | |
922 | * languages like Go. | |
923 | */ | |
d3bb89ea KW |
924 | return vma->vm_start <= vma->vm_mm->start_stack && |
925 | vma->vm_end >= vma->vm_mm->start_stack; | |
11250fd1 KW |
926 | } |
927 | ||
222100ee AK |
928 | static inline bool vma_is_temporary_stack(struct vm_area_struct *vma) |
929 | { | |
930 | int maybe_stack = vma->vm_flags & (VM_GROWSDOWN | VM_GROWSUP); | |
931 | ||
932 | if (!maybe_stack) | |
933 | return false; | |
934 | ||
935 | if ((vma->vm_flags & VM_STACK_INCOMPLETE_SETUP) == | |
936 | VM_STACK_INCOMPLETE_SETUP) | |
937 | return true; | |
938 | ||
939 | return false; | |
940 | } | |
941 | ||
7969f226 AK |
942 | static inline bool vma_is_foreign(struct vm_area_struct *vma) |
943 | { | |
944 | if (!current->mm) | |
945 | return true; | |
946 | ||
947 | if (current->mm != vma->vm_mm) | |
948 | return true; | |
949 | ||
950 | return false; | |
951 | } | |
3122e80e AK |
952 | |
953 | static inline bool vma_is_accessible(struct vm_area_struct *vma) | |
954 | { | |
6cb4d9a2 | 955 | return vma->vm_flags & VM_ACCESS_FLAGS; |
3122e80e AK |
956 | } |
957 | ||
e8e17ee9 LS |
958 | static inline bool is_shared_maywrite(vm_flags_t vm_flags) |
959 | { | |
960 | return (vm_flags & (VM_SHARED | VM_MAYWRITE)) == | |
961 | (VM_SHARED | VM_MAYWRITE); | |
962 | } | |
963 | ||
964 | static inline bool vma_is_shared_maywrite(struct vm_area_struct *vma) | |
965 | { | |
966 | return is_shared_maywrite(vma->vm_flags); | |
967 | } | |
968 | ||
f39af059 MWO |
969 | static inline |
970 | struct vm_area_struct *vma_find(struct vma_iterator *vmi, unsigned long max) | |
971 | { | |
b62b633e | 972 | return mas_find(&vmi->mas, max - 1); |
f39af059 MWO |
973 | } |
974 | ||
975 | static inline struct vm_area_struct *vma_next(struct vma_iterator *vmi) | |
976 | { | |
977 | /* | |
b62b633e | 978 | * Uses mas_find() to get the first VMA when the iterator starts. |
f39af059 MWO |
979 | * Calling mas_next() could skip the first entry. |
980 | */ | |
b62b633e | 981 | return mas_find(&vmi->mas, ULONG_MAX); |
f39af059 MWO |
982 | } |
983 | ||
bb5dbd22 LH |
984 | static inline |
985 | struct vm_area_struct *vma_iter_next_range(struct vma_iterator *vmi) | |
986 | { | |
987 | return mas_next_range(&vmi->mas, ULONG_MAX); | |
988 | } | |
989 | ||
990 | ||
f39af059 MWO |
991 | static inline struct vm_area_struct *vma_prev(struct vma_iterator *vmi) |
992 | { | |
993 | return mas_prev(&vmi->mas, 0); | |
994 | } | |
995 | ||
bb5dbd22 LH |
996 | static inline |
997 | struct vm_area_struct *vma_iter_prev_range(struct vma_iterator *vmi) | |
998 | { | |
999 | return mas_prev_range(&vmi->mas, 0); | |
1000 | } | |
1001 | ||
f39af059 MWO |
1002 | static inline unsigned long vma_iter_addr(struct vma_iterator *vmi) |
1003 | { | |
1004 | return vmi->mas.index; | |
1005 | } | |
1006 | ||
b62b633e LH |
1007 | static inline unsigned long vma_iter_end(struct vma_iterator *vmi) |
1008 | { | |
1009 | return vmi->mas.last + 1; | |
1010 | } | |
1011 | static inline int vma_iter_bulk_alloc(struct vma_iterator *vmi, | |
1012 | unsigned long count) | |
1013 | { | |
1014 | return mas_expected_entries(&vmi->mas, count); | |
1015 | } | |
1016 | ||
d2406291 PZ |
1017 | static inline int vma_iter_clear_gfp(struct vma_iterator *vmi, |
1018 | unsigned long start, unsigned long end, gfp_t gfp) | |
1019 | { | |
1020 | __mas_set_range(&vmi->mas, start, end - 1); | |
1021 | mas_store_gfp(&vmi->mas, NULL, gfp); | |
1022 | if (unlikely(mas_is_err(&vmi->mas))) | |
1023 | return -ENOMEM; | |
1024 | ||
1025 | return 0; | |
1026 | } | |
1027 | ||
b62b633e LH |
1028 | /* Free any unused preallocations */ |
1029 | static inline void vma_iter_free(struct vma_iterator *vmi) | |
1030 | { | |
1031 | mas_destroy(&vmi->mas); | |
1032 | } | |
1033 | ||
1034 | static inline int vma_iter_bulk_store(struct vma_iterator *vmi, | |
1035 | struct vm_area_struct *vma) | |
1036 | { | |
1037 | vmi->mas.index = vma->vm_start; | |
1038 | vmi->mas.last = vma->vm_end - 1; | |
1039 | mas_store(&vmi->mas, vma); | |
1040 | if (unlikely(mas_is_err(&vmi->mas))) | |
1041 | return -ENOMEM; | |
1042 | ||
1043 | return 0; | |
1044 | } | |
1045 | ||
1046 | static inline void vma_iter_invalidate(struct vma_iterator *vmi) | |
1047 | { | |
1048 | mas_pause(&vmi->mas); | |
1049 | } | |
1050 | ||
1051 | static inline void vma_iter_set(struct vma_iterator *vmi, unsigned long addr) | |
1052 | { | |
1053 | mas_set(&vmi->mas, addr); | |
1054 | } | |
1055 | ||
f39af059 MWO |
1056 | #define for_each_vma(__vmi, __vma) \ |
1057 | while (((__vma) = vma_next(&(__vmi))) != NULL) | |
1058 | ||
1059 | /* The MM code likes to work with exclusive end addresses */ | |
1060 | #define for_each_vma_range(__vmi, __vma, __end) \ | |
b62b633e | 1061 | while (((__vma) = vma_find(&(__vmi), (__end))) != NULL) |
f39af059 | 1062 | |
43675e6f YS |
1063 | #ifdef CONFIG_SHMEM |
1064 | /* | |
1065 | * The vma_is_shmem is not inline because it is used only by slow | |
1066 | * paths in userfault. | |
1067 | */ | |
1068 | bool vma_is_shmem(struct vm_area_struct *vma); | |
d09e8ca6 | 1069 | bool vma_is_anon_shmem(struct vm_area_struct *vma); |
43675e6f YS |
1070 | #else |
1071 | static inline bool vma_is_shmem(struct vm_area_struct *vma) { return false; } | |
d09e8ca6 | 1072 | static inline bool vma_is_anon_shmem(struct vm_area_struct *vma) { return false; } |
43675e6f YS |
1073 | #endif |
1074 | ||
1075 | int vma_is_stack_for_current(struct vm_area_struct *vma); | |
1076 | ||
8b11ec1b LT |
1077 | /* flush_tlb_range() takes a vma, not a mm, and can care about flags */ |
1078 | #define TLB_FLUSH_VMA(mm,flags) { .vm_mm = (mm), .vm_flags = (flags) } | |
1079 | ||
1da177e4 LT |
1080 | struct mmu_gather; |
1081 | struct inode; | |
1082 | ||
5eb5cea1 MWO |
1083 | /* |
1084 | * compound_order() can be called without holding a reference, which means | |
1085 | * that niceties like page_folio() don't work. These callers should be | |
1086 | * prepared to handle wild return values. For example, PG_head may be | |
ebc1baf5 | 1087 | * set before the order is initialised, or this may be a tail page. |
5eb5cea1 MWO |
1088 | * See compaction.c for some good examples. |
1089 | */ | |
5bf34d7c MWO |
1090 | static inline unsigned int compound_order(struct page *page) |
1091 | { | |
5eb5cea1 MWO |
1092 | struct folio *folio = (struct folio *)page; |
1093 | ||
1094 | if (!test_bit(PG_head, &folio->flags)) | |
5bf34d7c | 1095 | return 0; |
ebc1baf5 | 1096 | return folio->_flags_1 & 0xff; |
5bf34d7c MWO |
1097 | } |
1098 | ||
1099 | /** | |
1100 | * folio_order - The allocation order of a folio. | |
1101 | * @folio: The folio. | |
1102 | * | |
1103 | * A folio is composed of 2^order pages. See get_order() for the definition | |
1104 | * of order. | |
1105 | * | |
1106 | * Return: The order of the folio. | |
1107 | */ | |
1108 | static inline unsigned int folio_order(struct folio *folio) | |
1109 | { | |
c3a15bff MWO |
1110 | if (!folio_test_large(folio)) |
1111 | return 0; | |
ebc1baf5 | 1112 | return folio->_flags_1 & 0xff; |
5bf34d7c MWO |
1113 | } |
1114 | ||
71e3aac0 | 1115 | #include <linux/huge_mm.h> |
1da177e4 LT |
1116 | |
1117 | /* | |
1118 | * Methods to modify the page usage count. | |
1119 | * | |
1120 | * What counts for a page usage: | |
1121 | * - cache mapping (page->mapping) | |
1122 | * - private data (page->private) | |
1123 | * - page mapped in a task's page tables, each mapping | |
1124 | * is counted separately | |
1125 | * | |
1126 | * Also, many kernel routines increase the page count before a critical | |
1127 | * routine so they can be sure the page doesn't go away from under them. | |
1da177e4 LT |
1128 | */ |
1129 | ||
1130 | /* | |
da6052f7 | 1131 | * Drop a ref, return true if the refcount fell to zero (the page has no users) |
1da177e4 | 1132 | */ |
7c8ee9a8 NP |
1133 | static inline int put_page_testzero(struct page *page) |
1134 | { | |
fe896d18 JK |
1135 | VM_BUG_ON_PAGE(page_ref_count(page) == 0, page); |
1136 | return page_ref_dec_and_test(page); | |
7c8ee9a8 | 1137 | } |
1da177e4 | 1138 | |
b620f633 MWO |
1139 | static inline int folio_put_testzero(struct folio *folio) |
1140 | { | |
1141 | return put_page_testzero(&folio->page); | |
1142 | } | |
1143 | ||
1da177e4 | 1144 | /* |
7c8ee9a8 NP |
1145 | * Try to grab a ref unless the page has a refcount of zero, return false if |
1146 | * that is the case. | |
8e0861fa AK |
1147 | * This can be called when MMU is off so it must not access |
1148 | * any of the virtual mappings. | |
1da177e4 | 1149 | */ |
c2530328 | 1150 | static inline bool get_page_unless_zero(struct page *page) |
7c8ee9a8 | 1151 | { |
fe896d18 | 1152 | return page_ref_add_unless(page, 1, 0); |
7c8ee9a8 | 1153 | } |
1da177e4 | 1154 | |
3c1ea2c7 VMO |
1155 | static inline struct folio *folio_get_nontail_page(struct page *page) |
1156 | { | |
1157 | if (unlikely(!get_page_unless_zero(page))) | |
1158 | return NULL; | |
1159 | return (struct folio *)page; | |
1160 | } | |
1161 | ||
53df8fdc | 1162 | extern int page_is_ram(unsigned long pfn); |
124fe20d DW |
1163 | |
1164 | enum { | |
1165 | REGION_INTERSECTS, | |
1166 | REGION_DISJOINT, | |
1167 | REGION_MIXED, | |
1168 | }; | |
1169 | ||
1c29f25b TK |
1170 | int region_intersects(resource_size_t offset, size_t size, unsigned long flags, |
1171 | unsigned long desc); | |
53df8fdc | 1172 | |
48667e7a | 1173 | /* Support for virtually mapped pages */ |
b3bdda02 CL |
1174 | struct page *vmalloc_to_page(const void *addr); |
1175 | unsigned long vmalloc_to_pfn(const void *addr); | |
48667e7a | 1176 | |
0738c4bb PM |
1177 | /* |
1178 | * Determine if an address is within the vmalloc range | |
1179 | * | |
1180 | * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there | |
1181 | * is no special casing required. | |
1182 | */ | |
81ac3ad9 | 1183 | #ifdef CONFIG_MMU |
186525bd | 1184 | extern bool is_vmalloc_addr(const void *x); |
81ac3ad9 KH |
1185 | extern int is_vmalloc_or_module_addr(const void *x); |
1186 | #else | |
186525bd IM |
1187 | static inline bool is_vmalloc_addr(const void *x) |
1188 | { | |
1189 | return false; | |
1190 | } | |
934831d0 | 1191 | static inline int is_vmalloc_or_module_addr(const void *x) |
81ac3ad9 KH |
1192 | { |
1193 | return 0; | |
1194 | } | |
1195 | #endif | |
9e2779fa | 1196 | |
74e8ee47 MWO |
1197 | /* |
1198 | * How many times the entire folio is mapped as a single unit (eg by a | |
1199 | * PMD or PUD entry). This is probably not what you want, except for | |
cb67f428 | 1200 | * debugging purposes - it does not include PTE-mapped sub-pages; look |
5ce1f484 | 1201 | * at folio_mapcount() or page_mapcount() instead. |
74e8ee47 | 1202 | */ |
b84fd283 | 1203 | static inline int folio_entire_mapcount(const struct folio *folio) |
6dc5ea16 | 1204 | { |
74e8ee47 | 1205 | VM_BUG_ON_FOLIO(!folio_test_large(folio), folio); |
1aa4d03b | 1206 | return atomic_read(&folio->_entire_mapcount) + 1; |
53f9263b KS |
1207 | } |
1208 | ||
70b50f94 AA |
1209 | /* |
1210 | * The atomic page->_mapcount, starts from -1: so that transitions | |
1211 | * both from it and to it can be tracked, using atomic_inc_and_test | |
1212 | * and atomic_add_negative(-1). | |
1213 | */ | |
22b751c3 | 1214 | static inline void page_mapcount_reset(struct page *page) |
70b50f94 AA |
1215 | { |
1216 | atomic_set(&(page)->_mapcount, -1); | |
1217 | } | |
1218 | ||
c97eeb8f MWO |
1219 | /** |
1220 | * page_mapcount() - Number of times this precise page is mapped. | |
1221 | * @page: The page. | |
1222 | * | |
1223 | * The number of times this page is mapped. If this page is part of | |
1224 | * a large folio, it includes the number of times this page is mapped | |
1225 | * as part of that folio. | |
6988f31d | 1226 | * |
fd1a745c MWO |
1227 | * Will report 0 for pages which cannot be mapped into userspace, eg |
1228 | * slab, page tables and similar. | |
6988f31d | 1229 | */ |
70b50f94 AA |
1230 | static inline int page_mapcount(struct page *page) |
1231 | { | |
cb67f428 | 1232 | int mapcount = atomic_read(&page->_mapcount) + 1; |
b20ce5e0 | 1233 | |
fd1a745c MWO |
1234 | /* Handle page_has_type() pages */ |
1235 | if (mapcount < 0) | |
1236 | mapcount = 0; | |
c97eeb8f MWO |
1237 | if (unlikely(PageCompound(page))) |
1238 | mapcount += folio_entire_mapcount(page_folio(page)); | |
1239 | ||
1240 | return mapcount; | |
b20ce5e0 KS |
1241 | } |
1242 | ||
b84fd283 | 1243 | int folio_total_mapcount(const struct folio *folio); |
4ba1119c | 1244 | |
cb67f428 HD |
1245 | /** |
1246 | * folio_mapcount() - Calculate the number of mappings of this folio. | |
1247 | * @folio: The folio. | |
1248 | * | |
1249 | * A large folio tracks both how many times the entire folio is mapped, | |
1250 | * and how many times each individual page in the folio is mapped. | |
1251 | * This function calculates the total number of times the folio is | |
1252 | * mapped. | |
1253 | * | |
1254 | * Return: The number of times this folio is mapped. | |
1255 | */ | |
b84fd283 | 1256 | static inline int folio_mapcount(const struct folio *folio) |
4ba1119c | 1257 | { |
cb67f428 HD |
1258 | if (likely(!folio_test_large(folio))) |
1259 | return atomic_read(&folio->_mapcount) + 1; | |
b14224fb | 1260 | return folio_total_mapcount(folio); |
4ba1119c MWO |
1261 | } |
1262 | ||
b84fd283 | 1263 | static inline bool folio_large_is_mapped(const struct folio *folio) |
be5ef2d9 | 1264 | { |
4b51634c | 1265 | /* |
1aa4d03b | 1266 | * Reading _entire_mapcount below could be omitted if hugetlb |
eec20426 | 1267 | * participated in incrementing nr_pages_mapped when compound mapped. |
4b51634c | 1268 | */ |
eec20426 | 1269 | return atomic_read(&folio->_nr_pages_mapped) > 0 || |
1aa4d03b | 1270 | atomic_read(&folio->_entire_mapcount) >= 0; |
cb67f428 HD |
1271 | } |
1272 | ||
1273 | /** | |
1274 | * folio_mapped - Is this folio mapped into userspace? | |
1275 | * @folio: The folio. | |
1276 | * | |
1277 | * Return: True if any page in this folio is referenced by user page tables. | |
1278 | */ | |
1279 | static inline bool folio_mapped(struct folio *folio) | |
1280 | { | |
be5ef2d9 HD |
1281 | if (likely(!folio_test_large(folio))) |
1282 | return atomic_read(&folio->_mapcount) >= 0; | |
1283 | return folio_large_is_mapped(folio); | |
1284 | } | |
1285 | ||
1286 | /* | |
1287 | * Return true if this page is mapped into pagetables. | |
1288 | * For compound page it returns true if any sub-page of compound page is mapped, | |
1289 | * even if this particular sub-page is not itself mapped by any PTE or PMD. | |
1290 | */ | |
b84fd283 | 1291 | static inline bool page_mapped(const struct page *page) |
be5ef2d9 HD |
1292 | { |
1293 | if (likely(!PageCompound(page))) | |
1294 | return atomic_read(&page->_mapcount) >= 0; | |
1295 | return folio_large_is_mapped(page_folio(page)); | |
70b50f94 AA |
1296 | } |
1297 | ||
b49af68f CL |
1298 | static inline struct page *virt_to_head_page(const void *x) |
1299 | { | |
1300 | struct page *page = virt_to_page(x); | |
ccaafd7f | 1301 | |
1d798ca3 | 1302 | return compound_head(page); |
b49af68f CL |
1303 | } |
1304 | ||
7d4203c1 VB |
1305 | static inline struct folio *virt_to_folio(const void *x) |
1306 | { | |
1307 | struct page *page = virt_to_page(x); | |
1308 | ||
1309 | return page_folio(page); | |
1310 | } | |
1311 | ||
8d29c703 | 1312 | void __folio_put(struct folio *folio); |
ddc58f27 | 1313 | |
1d7ea732 | 1314 | void put_pages_list(struct list_head *pages); |
1da177e4 | 1315 | |
8dfcc9ba | 1316 | void split_page(struct page *page, unsigned int order); |
715cbfd6 | 1317 | void folio_copy(struct folio *dst, struct folio *src); |
8dfcc9ba | 1318 | |
a1554c00 ML |
1319 | unsigned long nr_free_buffer_pages(void); |
1320 | ||
5375336c | 1321 | void destroy_large_folio(struct folio *folio); |
33f2ef89 | 1322 | |
a50b854e MWO |
1323 | /* Returns the number of bytes in this potentially compound page. */ |
1324 | static inline unsigned long page_size(struct page *page) | |
1325 | { | |
1326 | return PAGE_SIZE << compound_order(page); | |
1327 | } | |
1328 | ||
94ad9338 MWO |
1329 | /* Returns the number of bits needed for the number of bytes in a page */ |
1330 | static inline unsigned int page_shift(struct page *page) | |
1331 | { | |
1332 | return PAGE_SHIFT + compound_order(page); | |
1333 | } | |
1334 | ||
18788cfa MWO |
1335 | /** |
1336 | * thp_order - Order of a transparent huge page. | |
1337 | * @page: Head page of a transparent huge page. | |
1338 | */ | |
1339 | static inline unsigned int thp_order(struct page *page) | |
1340 | { | |
1341 | VM_BUG_ON_PGFLAGS(PageTail(page), page); | |
1342 | return compound_order(page); | |
1343 | } | |
1344 | ||
18788cfa MWO |
1345 | /** |
1346 | * thp_size - Size of a transparent huge page. | |
1347 | * @page: Head page of a transparent huge page. | |
1348 | * | |
1349 | * Return: Number of bytes in this page. | |
1350 | */ | |
1351 | static inline unsigned long thp_size(struct page *page) | |
1352 | { | |
1353 | return PAGE_SIZE << thp_order(page); | |
1354 | } | |
1355 | ||
3dece370 | 1356 | #ifdef CONFIG_MMU |
14fd403f AA |
1357 | /* |
1358 | * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when | |
1359 | * servicing faults for write access. In the normal case, do always want | |
1360 | * pte_mkwrite. But get_user_pages can cause write faults for mappings | |
1361 | * that do not have writing enabled, when used by access_process_vm. | |
1362 | */ | |
1363 | static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma) | |
1364 | { | |
1365 | if (likely(vma->vm_flags & VM_WRITE)) | |
161e393c | 1366 | pte = pte_mkwrite(pte, vma); |
14fd403f AA |
1367 | return pte; |
1368 | } | |
8c6e50b0 | 1369 | |
f9ce0be7 | 1370 | vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page); |
3bd786f7 YF |
1371 | void set_pte_range(struct vm_fault *vmf, struct folio *folio, |
1372 | struct page *page, unsigned int nr, unsigned long addr); | |
f9ce0be7 | 1373 | |
2b740303 | 1374 | vm_fault_t finish_fault(struct vm_fault *vmf); |
3dece370 | 1375 | #endif |
14fd403f | 1376 | |
1da177e4 LT |
1377 | /* |
1378 | * Multiple processes may "see" the same page. E.g. for untouched | |
1379 | * mappings of /dev/null, all processes see the same page full of | |
1380 | * zeroes, and text pages of executables and shared libraries have | |
1381 | * only one copy in memory, at most, normally. | |
1382 | * | |
1383 | * For the non-reserved pages, page_count(page) denotes a reference count. | |
7e871b6c PBG |
1384 | * page_count() == 0 means the page is free. page->lru is then used for |
1385 | * freelist management in the buddy allocator. | |
da6052f7 | 1386 | * page_count() > 0 means the page has been allocated. |
1da177e4 | 1387 | * |
da6052f7 NP |
1388 | * Pages are allocated by the slab allocator in order to provide memory |
1389 | * to kmalloc and kmem_cache_alloc. In this case, the management of the | |
1390 | * page, and the fields in 'struct page' are the responsibility of mm/slab.c | |
1391 | * unless a particular usage is carefully commented. (the responsibility of | |
1392 | * freeing the kmalloc memory is the caller's, of course). | |
1da177e4 | 1393 | * |
da6052f7 NP |
1394 | * A page may be used by anyone else who does a __get_free_page(). |
1395 | * In this case, page_count still tracks the references, and should only | |
1396 | * be used through the normal accessor functions. The top bits of page->flags | |
1397 | * and page->virtual store page management information, but all other fields | |
1398 | * are unused and could be used privately, carefully. The management of this | |
1399 | * page is the responsibility of the one who allocated it, and those who have | |
1400 | * subsequently been given references to it. | |
1401 | * | |
1402 | * The other pages (we may call them "pagecache pages") are completely | |
1da177e4 LT |
1403 | * managed by the Linux memory manager: I/O, buffers, swapping etc. |
1404 | * The following discussion applies only to them. | |
1405 | * | |
da6052f7 NP |
1406 | * A pagecache page contains an opaque `private' member, which belongs to the |
1407 | * page's address_space. Usually, this is the address of a circular list of | |
1408 | * the page's disk buffers. PG_private must be set to tell the VM to call | |
1409 | * into the filesystem to release these pages. | |
1da177e4 | 1410 | * |
da6052f7 NP |
1411 | * A page may belong to an inode's memory mapping. In this case, page->mapping |
1412 | * is the pointer to the inode, and page->index is the file offset of the page, | |
ea1754a0 | 1413 | * in units of PAGE_SIZE. |
1da177e4 | 1414 | * |
da6052f7 NP |
1415 | * If pagecache pages are not associated with an inode, they are said to be |
1416 | * anonymous pages. These may become associated with the swapcache, and in that | |
1417 | * case PG_swapcache is set, and page->private is an offset into the swapcache. | |
1da177e4 | 1418 | * |
da6052f7 NP |
1419 | * In either case (swapcache or inode backed), the pagecache itself holds one |
1420 | * reference to the page. Setting PG_private should also increment the | |
1421 | * refcount. The each user mapping also has a reference to the page. | |
1da177e4 | 1422 | * |
da6052f7 | 1423 | * The pagecache pages are stored in a per-mapping radix tree, which is |
b93b0163 | 1424 | * rooted at mapping->i_pages, and indexed by offset. |
da6052f7 NP |
1425 | * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space |
1426 | * lists, we instead now tag pages as dirty/writeback in the radix tree. | |
1da177e4 | 1427 | * |
da6052f7 | 1428 | * All pagecache pages may be subject to I/O: |
1da177e4 LT |
1429 | * - inode pages may need to be read from disk, |
1430 | * - inode pages which have been modified and are MAP_SHARED may need | |
da6052f7 NP |
1431 | * to be written back to the inode on disk, |
1432 | * - anonymous pages (including MAP_PRIVATE file mappings) which have been | |
1433 | * modified may need to be swapped out to swap space and (later) to be read | |
1434 | * back into memory. | |
1da177e4 LT |
1435 | */ |
1436 | ||
27674ef6 | 1437 | #if defined(CONFIG_ZONE_DEVICE) && defined(CONFIG_FS_DAX) |
e7638488 | 1438 | DECLARE_STATIC_KEY_FALSE(devmap_managed_key); |
07d80269 | 1439 | |
f4f451a1 MS |
1440 | bool __put_devmap_managed_page_refs(struct page *page, int refs); |
1441 | static inline bool put_devmap_managed_page_refs(struct page *page, int refs) | |
e7638488 DW |
1442 | { |
1443 | if (!static_branch_unlikely(&devmap_managed_key)) | |
1444 | return false; | |
1445 | if (!is_zone_device_page(page)) | |
1446 | return false; | |
f4f451a1 | 1447 | return __put_devmap_managed_page_refs(page, refs); |
e7638488 | 1448 | } |
27674ef6 | 1449 | #else /* CONFIG_ZONE_DEVICE && CONFIG_FS_DAX */ |
f4f451a1 | 1450 | static inline bool put_devmap_managed_page_refs(struct page *page, int refs) |
e7638488 DW |
1451 | { |
1452 | return false; | |
1453 | } | |
27674ef6 | 1454 | #endif /* CONFIG_ZONE_DEVICE && CONFIG_FS_DAX */ |
7b2d55d2 | 1455 | |
f4f451a1 MS |
1456 | static inline bool put_devmap_managed_page(struct page *page) |
1457 | { | |
1458 | return put_devmap_managed_page_refs(page, 1); | |
1459 | } | |
1460 | ||
f958d7b5 | 1461 | /* 127: arbitrary random number, small enough to assemble well */ |
86d234cb MWO |
1462 | #define folio_ref_zero_or_close_to_overflow(folio) \ |
1463 | ((unsigned int) folio_ref_count(folio) + 127u <= 127u) | |
1464 | ||
1465 | /** | |
1466 | * folio_get - Increment the reference count on a folio. | |
1467 | * @folio: The folio. | |
1468 | * | |
1469 | * Context: May be called in any context, as long as you know that | |
1470 | * you have a refcount on the folio. If you do not already have one, | |
1471 | * folio_try_get() may be the right interface for you to use. | |
1472 | */ | |
1473 | static inline void folio_get(struct folio *folio) | |
1474 | { | |
1475 | VM_BUG_ON_FOLIO(folio_ref_zero_or_close_to_overflow(folio), folio); | |
1476 | folio_ref_inc(folio); | |
1477 | } | |
f958d7b5 | 1478 | |
3565fce3 DW |
1479 | static inline void get_page(struct page *page) |
1480 | { | |
86d234cb | 1481 | folio_get(page_folio(page)); |
3565fce3 DW |
1482 | } |
1483 | ||
cd1adf1b LT |
1484 | static inline __must_check bool try_get_page(struct page *page) |
1485 | { | |
1486 | page = compound_head(page); | |
1487 | if (WARN_ON_ONCE(page_ref_count(page) <= 0)) | |
1488 | return false; | |
1489 | page_ref_inc(page); | |
1490 | return true; | |
1491 | } | |
3565fce3 | 1492 | |
b620f633 MWO |
1493 | /** |
1494 | * folio_put - Decrement the reference count on a folio. | |
1495 | * @folio: The folio. | |
1496 | * | |
1497 | * If the folio's reference count reaches zero, the memory will be | |
1498 | * released back to the page allocator and may be used by another | |
1499 | * allocation immediately. Do not access the memory or the struct folio | |
1500 | * after calling folio_put() unless you can be sure that it wasn't the | |
1501 | * last reference. | |
1502 | * | |
1503 | * Context: May be called in process or interrupt context, but not in NMI | |
1504 | * context. May be called while holding a spinlock. | |
1505 | */ | |
1506 | static inline void folio_put(struct folio *folio) | |
1507 | { | |
1508 | if (folio_put_testzero(folio)) | |
8d29c703 | 1509 | __folio_put(folio); |
b620f633 MWO |
1510 | } |
1511 | ||
3fe7fa58 MWO |
1512 | /** |
1513 | * folio_put_refs - Reduce the reference count on a folio. | |
1514 | * @folio: The folio. | |
1515 | * @refs: The amount to subtract from the folio's reference count. | |
1516 | * | |
1517 | * If the folio's reference count reaches zero, the memory will be | |
1518 | * released back to the page allocator and may be used by another | |
1519 | * allocation immediately. Do not access the memory or the struct folio | |
1520 | * after calling folio_put_refs() unless you can be sure that these weren't | |
1521 | * the last references. | |
1522 | * | |
1523 | * Context: May be called in process or interrupt context, but not in NMI | |
1524 | * context. May be called while holding a spinlock. | |
1525 | */ | |
1526 | static inline void folio_put_refs(struct folio *folio, int refs) | |
1527 | { | |
1528 | if (folio_ref_sub_and_test(folio, refs)) | |
8d29c703 | 1529 | __folio_put(folio); |
3fe7fa58 MWO |
1530 | } |
1531 | ||
99fbb6bf MWO |
1532 | void folios_put_refs(struct folio_batch *folios, unsigned int *refs); |
1533 | ||
0411d6ee SP |
1534 | /* |
1535 | * union release_pages_arg - an array of pages or folios | |
449c7967 | 1536 | * |
0411d6ee | 1537 | * release_pages() releases a simple array of multiple pages, and |
449c7967 LT |
1538 | * accepts various different forms of said page array: either |
1539 | * a regular old boring array of pages, an array of folios, or | |
1540 | * an array of encoded page pointers. | |
1541 | * | |
1542 | * The transparent union syntax for this kind of "any of these | |
1543 | * argument types" is all kinds of ugly, so look away. | |
1544 | */ | |
1545 | typedef union { | |
1546 | struct page **pages; | |
1547 | struct folio **folios; | |
1548 | struct encoded_page **encoded_pages; | |
1549 | } release_pages_arg __attribute__ ((__transparent_union__)); | |
1550 | ||
1551 | void release_pages(release_pages_arg, int nr); | |
e3c4cebf MWO |
1552 | |
1553 | /** | |
1554 | * folios_put - Decrement the reference count on an array of folios. | |
1555 | * @folios: The folios. | |
e3c4cebf | 1556 | * |
99fbb6bf MWO |
1557 | * Like folio_put(), but for a batch of folios. This is more efficient |
1558 | * than writing the loop yourself as it will optimise the locks which need | |
1559 | * to be taken if the folios are freed. The folios batch is returned | |
1560 | * empty and ready to be reused for another batch; there is no need to | |
1561 | * reinitialise it. | |
e3c4cebf MWO |
1562 | * |
1563 | * Context: May be called in process or interrupt context, but not in NMI | |
1564 | * context. May be called while holding a spinlock. | |
1565 | */ | |
99fbb6bf | 1566 | static inline void folios_put(struct folio_batch *folios) |
e3c4cebf | 1567 | { |
99fbb6bf | 1568 | folios_put_refs(folios, NULL); |
3fe7fa58 MWO |
1569 | } |
1570 | ||
3565fce3 DW |
1571 | static inline void put_page(struct page *page) |
1572 | { | |
b620f633 | 1573 | struct folio *folio = page_folio(page); |
3565fce3 | 1574 | |
7b2d55d2 | 1575 | /* |
89574945 CH |
1576 | * For some devmap managed pages we need to catch refcount transition |
1577 | * from 2 to 1: | |
7b2d55d2 | 1578 | */ |
89574945 | 1579 | if (put_devmap_managed_page(&folio->page)) |
7b2d55d2 | 1580 | return; |
b620f633 | 1581 | folio_put(folio); |
3565fce3 DW |
1582 | } |
1583 | ||
3faa52c0 JH |
1584 | /* |
1585 | * GUP_PIN_COUNTING_BIAS, and the associated functions that use it, overload | |
1586 | * the page's refcount so that two separate items are tracked: the original page | |
1587 | * reference count, and also a new count of how many pin_user_pages() calls were | |
1588 | * made against the page. ("gup-pinned" is another term for the latter). | |
1589 | * | |
1590 | * With this scheme, pin_user_pages() becomes special: such pages are marked as | |
1591 | * distinct from normal pages. As such, the unpin_user_page() call (and its | |
1592 | * variants) must be used in order to release gup-pinned pages. | |
1593 | * | |
1594 | * Choice of value: | |
1595 | * | |
1596 | * By making GUP_PIN_COUNTING_BIAS a power of two, debugging of page reference | |
1597 | * counts with respect to pin_user_pages() and unpin_user_page() becomes | |
1598 | * simpler, due to the fact that adding an even power of two to the page | |
1599 | * refcount has the effect of using only the upper N bits, for the code that | |
1600 | * counts up using the bias value. This means that the lower bits are left for | |
1601 | * the exclusive use of the original code that increments and decrements by one | |
1602 | * (or at least, by much smaller values than the bias value). | |
fc1d8e7c | 1603 | * |
3faa52c0 JH |
1604 | * Of course, once the lower bits overflow into the upper bits (and this is |
1605 | * OK, because subtraction recovers the original values), then visual inspection | |
1606 | * no longer suffices to directly view the separate counts. However, for normal | |
1607 | * applications that don't have huge page reference counts, this won't be an | |
1608 | * issue. | |
fc1d8e7c | 1609 | * |
40fcc7fc MWO |
1610 | * Locking: the lockless algorithm described in folio_try_get_rcu() |
1611 | * provides safe operation for get_user_pages(), page_mkclean() and | |
1612 | * other calls that race to set up page table entries. | |
fc1d8e7c | 1613 | */ |
3faa52c0 | 1614 | #define GUP_PIN_COUNTING_BIAS (1U << 10) |
fc1d8e7c | 1615 | |
3faa52c0 | 1616 | void unpin_user_page(struct page *page); |
f1f6a7dd JH |
1617 | void unpin_user_pages_dirty_lock(struct page **pages, unsigned long npages, |
1618 | bool make_dirty); | |
458a4f78 JM |
1619 | void unpin_user_page_range_dirty_lock(struct page *page, unsigned long npages, |
1620 | bool make_dirty); | |
f1f6a7dd | 1621 | void unpin_user_pages(struct page **pages, unsigned long npages); |
fc1d8e7c | 1622 | |
97a7e473 PX |
1623 | static inline bool is_cow_mapping(vm_flags_t flags) |
1624 | { | |
1625 | return (flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE; | |
1626 | } | |
1627 | ||
fc4f4be9 DH |
1628 | #ifndef CONFIG_MMU |
1629 | static inline bool is_nommu_shared_mapping(vm_flags_t flags) | |
1630 | { | |
1631 | /* | |
1632 | * NOMMU shared mappings are ordinary MAP_SHARED mappings and selected | |
1633 | * R/O MAP_PRIVATE file mappings that are an effective R/O overlay of | |
1634 | * a file mapping. R/O MAP_PRIVATE mappings might still modify | |
1635 | * underlying memory if ptrace is active, so this is only possible if | |
1636 | * ptrace does not apply. Note that there is no mprotect() to upgrade | |
1637 | * write permissions later. | |
1638 | */ | |
b6b7a8fa | 1639 | return flags & (VM_MAYSHARE | VM_MAYOVERLAY); |
fc4f4be9 DH |
1640 | } |
1641 | #endif | |
1642 | ||
9127ab4f CS |
1643 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
1644 | #define SECTION_IN_PAGE_FLAGS | |
1645 | #endif | |
1646 | ||
89689ae7 | 1647 | /* |
7a8010cd VB |
1648 | * The identification function is mainly used by the buddy allocator for |
1649 | * determining if two pages could be buddies. We are not really identifying | |
1650 | * the zone since we could be using the section number id if we do not have | |
1651 | * node id available in page flags. | |
1652 | * We only guarantee that it will return the same value for two combinable | |
1653 | * pages in a zone. | |
89689ae7 | 1654 | */ |
cb2b95e1 AW |
1655 | static inline int page_zone_id(struct page *page) |
1656 | { | |
89689ae7 | 1657 | return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK; |
348f8b6c DH |
1658 | } |
1659 | ||
89689ae7 | 1660 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
9164448d | 1661 | int page_to_nid(const struct page *page); |
89689ae7 | 1662 | #else |
33dd4e0e | 1663 | static inline int page_to_nid(const struct page *page) |
d41dee36 | 1664 | { |
9164448d | 1665 | return (PF_POISONED_CHECK(page)->flags >> NODES_PGSHIFT) & NODES_MASK; |
d41dee36 | 1666 | } |
89689ae7 CL |
1667 | #endif |
1668 | ||
874fd90c MWO |
1669 | static inline int folio_nid(const struct folio *folio) |
1670 | { | |
1671 | return page_to_nid(&folio->page); | |
1672 | } | |
1673 | ||
57e0a030 | 1674 | #ifdef CONFIG_NUMA_BALANCING |
33024536 HY |
1675 | /* page access time bits needs to hold at least 4 seconds */ |
1676 | #define PAGE_ACCESS_TIME_MIN_BITS 12 | |
1677 | #if LAST_CPUPID_SHIFT < PAGE_ACCESS_TIME_MIN_BITS | |
1678 | #define PAGE_ACCESS_TIME_BUCKETS \ | |
1679 | (PAGE_ACCESS_TIME_MIN_BITS - LAST_CPUPID_SHIFT) | |
1680 | #else | |
1681 | #define PAGE_ACCESS_TIME_BUCKETS 0 | |
1682 | #endif | |
1683 | ||
1684 | #define PAGE_ACCESS_TIME_MASK \ | |
1685 | (LAST_CPUPID_MASK << PAGE_ACCESS_TIME_BUCKETS) | |
1686 | ||
90572890 | 1687 | static inline int cpu_pid_to_cpupid(int cpu, int pid) |
57e0a030 | 1688 | { |
90572890 | 1689 | return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK); |
57e0a030 MG |
1690 | } |
1691 | ||
90572890 | 1692 | static inline int cpupid_to_pid(int cpupid) |
57e0a030 | 1693 | { |
90572890 | 1694 | return cpupid & LAST__PID_MASK; |
57e0a030 | 1695 | } |
b795854b | 1696 | |
90572890 | 1697 | static inline int cpupid_to_cpu(int cpupid) |
b795854b | 1698 | { |
90572890 | 1699 | return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK; |
b795854b MG |
1700 | } |
1701 | ||
90572890 | 1702 | static inline int cpupid_to_nid(int cpupid) |
b795854b | 1703 | { |
90572890 | 1704 | return cpu_to_node(cpupid_to_cpu(cpupid)); |
b795854b MG |
1705 | } |
1706 | ||
90572890 | 1707 | static inline bool cpupid_pid_unset(int cpupid) |
57e0a030 | 1708 | { |
90572890 | 1709 | return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK); |
b795854b MG |
1710 | } |
1711 | ||
90572890 | 1712 | static inline bool cpupid_cpu_unset(int cpupid) |
b795854b | 1713 | { |
90572890 | 1714 | return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK); |
b795854b MG |
1715 | } |
1716 | ||
8c8a743c PZ |
1717 | static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid) |
1718 | { | |
1719 | return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid); | |
1720 | } | |
1721 | ||
1722 | #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid) | |
90572890 | 1723 | #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS |
8f0f4788 | 1724 | static inline int folio_xchg_last_cpupid(struct folio *folio, int cpupid) |
b795854b | 1725 | { |
8f0f4788 | 1726 | return xchg(&folio->_last_cpupid, cpupid & LAST_CPUPID_MASK); |
b795854b | 1727 | } |
90572890 | 1728 | |
f39eac30 | 1729 | static inline int folio_last_cpupid(struct folio *folio) |
90572890 | 1730 | { |
f39eac30 | 1731 | return folio->_last_cpupid; |
90572890 PZ |
1732 | } |
1733 | static inline void page_cpupid_reset_last(struct page *page) | |
b795854b | 1734 | { |
1ae71d03 | 1735 | page->_last_cpupid = -1 & LAST_CPUPID_MASK; |
57e0a030 MG |
1736 | } |
1737 | #else | |
f39eac30 | 1738 | static inline int folio_last_cpupid(struct folio *folio) |
75980e97 | 1739 | { |
f39eac30 | 1740 | return (folio->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK; |
75980e97 PZ |
1741 | } |
1742 | ||
8f0f4788 | 1743 | int folio_xchg_last_cpupid(struct folio *folio, int cpupid); |
75980e97 | 1744 | |
90572890 | 1745 | static inline void page_cpupid_reset_last(struct page *page) |
75980e97 | 1746 | { |
09940a4f | 1747 | page->flags |= LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT; |
75980e97 | 1748 | } |
90572890 | 1749 | #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */ |
33024536 | 1750 | |
f3930843 | 1751 | static inline int folio_xchg_access_time(struct folio *folio, int time) |
33024536 HY |
1752 | { |
1753 | int last_time; | |
1754 | ||
8f0f4788 KW |
1755 | last_time = folio_xchg_last_cpupid(folio, |
1756 | time >> PAGE_ACCESS_TIME_BUCKETS); | |
33024536 HY |
1757 | return last_time << PAGE_ACCESS_TIME_BUCKETS; |
1758 | } | |
fc137c0d R |
1759 | |
1760 | static inline void vma_set_access_pid_bit(struct vm_area_struct *vma) | |
1761 | { | |
1762 | unsigned int pid_bit; | |
1763 | ||
d46031f4 | 1764 | pid_bit = hash_32(current->pid, ilog2(BITS_PER_LONG)); |
f3a6c979 MG |
1765 | if (vma->numab_state && !test_bit(pid_bit, &vma->numab_state->pids_active[1])) { |
1766 | __set_bit(pid_bit, &vma->numab_state->pids_active[1]); | |
fc137c0d R |
1767 | } |
1768 | } | |
90572890 | 1769 | #else /* !CONFIG_NUMA_BALANCING */ |
8f0f4788 | 1770 | static inline int folio_xchg_last_cpupid(struct folio *folio, int cpupid) |
57e0a030 | 1771 | { |
8f0f4788 | 1772 | return folio_nid(folio); /* XXX */ |
57e0a030 MG |
1773 | } |
1774 | ||
f3930843 | 1775 | static inline int folio_xchg_access_time(struct folio *folio, int time) |
33024536 HY |
1776 | { |
1777 | return 0; | |
1778 | } | |
1779 | ||
f39eac30 | 1780 | static inline int folio_last_cpupid(struct folio *folio) |
57e0a030 | 1781 | { |
f39eac30 | 1782 | return folio_nid(folio); /* XXX */ |
57e0a030 MG |
1783 | } |
1784 | ||
90572890 | 1785 | static inline int cpupid_to_nid(int cpupid) |
b795854b MG |
1786 | { |
1787 | return -1; | |
1788 | } | |
1789 | ||
90572890 | 1790 | static inline int cpupid_to_pid(int cpupid) |
b795854b MG |
1791 | { |
1792 | return -1; | |
1793 | } | |
1794 | ||
90572890 | 1795 | static inline int cpupid_to_cpu(int cpupid) |
b795854b MG |
1796 | { |
1797 | return -1; | |
1798 | } | |
1799 | ||
90572890 PZ |
1800 | static inline int cpu_pid_to_cpupid(int nid, int pid) |
1801 | { | |
1802 | return -1; | |
1803 | } | |
1804 | ||
1805 | static inline bool cpupid_pid_unset(int cpupid) | |
b795854b | 1806 | { |
2b787449 | 1807 | return true; |
b795854b MG |
1808 | } |
1809 | ||
90572890 | 1810 | static inline void page_cpupid_reset_last(struct page *page) |
57e0a030 MG |
1811 | { |
1812 | } | |
8c8a743c PZ |
1813 | |
1814 | static inline bool cpupid_match_pid(struct task_struct *task, int cpupid) | |
1815 | { | |
1816 | return false; | |
1817 | } | |
fc137c0d R |
1818 | |
1819 | static inline void vma_set_access_pid_bit(struct vm_area_struct *vma) | |
1820 | { | |
1821 | } | |
90572890 | 1822 | #endif /* CONFIG_NUMA_BALANCING */ |
57e0a030 | 1823 | |
2e903b91 | 1824 | #if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS) |
34303244 | 1825 | |
cf10bd4c AK |
1826 | /* |
1827 | * KASAN per-page tags are stored xor'ed with 0xff. This allows to avoid | |
1828 | * setting tags for all pages to native kernel tag value 0xff, as the default | |
1829 | * value 0x00 maps to 0xff. | |
1830 | */ | |
1831 | ||
2813b9c0 AK |
1832 | static inline u8 page_kasan_tag(const struct page *page) |
1833 | { | |
5cb6674b | 1834 | u8 tag = KASAN_TAG_KERNEL; |
cf10bd4c AK |
1835 | |
1836 | if (kasan_enabled()) { | |
1837 | tag = (page->flags >> KASAN_TAG_PGSHIFT) & KASAN_TAG_MASK; | |
1838 | tag ^= 0xff; | |
1839 | } | |
1840 | ||
1841 | return tag; | |
2813b9c0 AK |
1842 | } |
1843 | ||
1844 | static inline void page_kasan_tag_set(struct page *page, u8 tag) | |
1845 | { | |
27fe7339 PC |
1846 | unsigned long old_flags, flags; |
1847 | ||
1848 | if (!kasan_enabled()) | |
1849 | return; | |
1850 | ||
1851 | tag ^= 0xff; | |
1852 | old_flags = READ_ONCE(page->flags); | |
1853 | do { | |
1854 | flags = old_flags; | |
1855 | flags &= ~(KASAN_TAG_MASK << KASAN_TAG_PGSHIFT); | |
1856 | flags |= (tag & KASAN_TAG_MASK) << KASAN_TAG_PGSHIFT; | |
1857 | } while (unlikely(!try_cmpxchg(&page->flags, &old_flags, flags))); | |
2813b9c0 AK |
1858 | } |
1859 | ||
1860 | static inline void page_kasan_tag_reset(struct page *page) | |
1861 | { | |
34303244 | 1862 | if (kasan_enabled()) |
5cb6674b | 1863 | page_kasan_tag_set(page, KASAN_TAG_KERNEL); |
2813b9c0 | 1864 | } |
34303244 AK |
1865 | |
1866 | #else /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ | |
1867 | ||
2813b9c0 AK |
1868 | static inline u8 page_kasan_tag(const struct page *page) |
1869 | { | |
1870 | return 0xff; | |
1871 | } | |
1872 | ||
1873 | static inline void page_kasan_tag_set(struct page *page, u8 tag) { } | |
1874 | static inline void page_kasan_tag_reset(struct page *page) { } | |
34303244 AK |
1875 | |
1876 | #endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ | |
2813b9c0 | 1877 | |
33dd4e0e | 1878 | static inline struct zone *page_zone(const struct page *page) |
89689ae7 CL |
1879 | { |
1880 | return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]; | |
1881 | } | |
1882 | ||
75ef7184 MG |
1883 | static inline pg_data_t *page_pgdat(const struct page *page) |
1884 | { | |
1885 | return NODE_DATA(page_to_nid(page)); | |
1886 | } | |
1887 | ||
32b8fc48 MWO |
1888 | static inline struct zone *folio_zone(const struct folio *folio) |
1889 | { | |
1890 | return page_zone(&folio->page); | |
1891 | } | |
1892 | ||
1893 | static inline pg_data_t *folio_pgdat(const struct folio *folio) | |
1894 | { | |
1895 | return page_pgdat(&folio->page); | |
1896 | } | |
1897 | ||
9127ab4f | 1898 | #ifdef SECTION_IN_PAGE_FLAGS |
bf4e8902 DK |
1899 | static inline void set_page_section(struct page *page, unsigned long section) |
1900 | { | |
1901 | page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT); | |
1902 | page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT; | |
1903 | } | |
1904 | ||
aa462abe | 1905 | static inline unsigned long page_to_section(const struct page *page) |
d41dee36 AW |
1906 | { |
1907 | return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK; | |
1908 | } | |
308c05e3 | 1909 | #endif |
d41dee36 | 1910 | |
bf6bd276 MWO |
1911 | /** |
1912 | * folio_pfn - Return the Page Frame Number of a folio. | |
1913 | * @folio: The folio. | |
1914 | * | |
1915 | * A folio may contain multiple pages. The pages have consecutive | |
1916 | * Page Frame Numbers. | |
1917 | * | |
1918 | * Return: The Page Frame Number of the first page in the folio. | |
1919 | */ | |
1920 | static inline unsigned long folio_pfn(struct folio *folio) | |
1921 | { | |
1922 | return page_to_pfn(&folio->page); | |
1923 | } | |
1924 | ||
018ee47f YZ |
1925 | static inline struct folio *pfn_folio(unsigned long pfn) |
1926 | { | |
1927 | return page_folio(pfn_to_page(pfn)); | |
1928 | } | |
1929 | ||
0b90ddae MWO |
1930 | /** |
1931 | * folio_maybe_dma_pinned - Report if a folio may be pinned for DMA. | |
1932 | * @folio: The folio. | |
1933 | * | |
1934 | * This function checks if a folio has been pinned via a call to | |
1935 | * a function in the pin_user_pages() family. | |
1936 | * | |
1937 | * For small folios, the return value is partially fuzzy: false is not fuzzy, | |
1938 | * because it means "definitely not pinned for DMA", but true means "probably | |
1939 | * pinned for DMA, but possibly a false positive due to having at least | |
1940 | * GUP_PIN_COUNTING_BIAS worth of normal folio references". | |
1941 | * | |
1942 | * False positives are OK, because: a) it's unlikely for a folio to | |
1943 | * get that many refcounts, and b) all the callers of this routine are | |
1944 | * expected to be able to deal gracefully with a false positive. | |
1945 | * | |
1946 | * For large folios, the result will be exactly correct. That's because | |
94688e8e | 1947 | * we have more tracking data available: the _pincount field is used |
0b90ddae MWO |
1948 | * instead of the GUP_PIN_COUNTING_BIAS scheme. |
1949 | * | |
1950 | * For more information, please see Documentation/core-api/pin_user_pages.rst. | |
1951 | * | |
1952 | * Return: True, if it is likely that the page has been "dma-pinned". | |
1953 | * False, if the page is definitely not dma-pinned. | |
1954 | */ | |
1955 | static inline bool folio_maybe_dma_pinned(struct folio *folio) | |
1956 | { | |
1957 | if (folio_test_large(folio)) | |
94688e8e | 1958 | return atomic_read(&folio->_pincount) > 0; |
0b90ddae MWO |
1959 | |
1960 | /* | |
1961 | * folio_ref_count() is signed. If that refcount overflows, then | |
1962 | * folio_ref_count() returns a negative value, and callers will avoid | |
1963 | * further incrementing the refcount. | |
1964 | * | |
1965 | * Here, for that overflow case, use the sign bit to count a little | |
1966 | * bit higher via unsigned math, and thus still get an accurate result. | |
1967 | */ | |
1968 | return ((unsigned int)folio_ref_count(folio)) >= | |
1969 | GUP_PIN_COUNTING_BIAS; | |
1970 | } | |
1971 | ||
1972 | static inline bool page_maybe_dma_pinned(struct page *page) | |
1973 | { | |
1974 | return folio_maybe_dma_pinned(page_folio(page)); | |
1975 | } | |
1976 | ||
1977 | /* | |
1978 | * This should most likely only be called during fork() to see whether we | |
fb3d824d | 1979 | * should break the cow immediately for an anon page on the src mm. |
623a1ddf DH |
1980 | * |
1981 | * The caller has to hold the PT lock and the vma->vm_mm->->write_protect_seq. | |
0b90ddae | 1982 | */ |
ebe2e35e DH |
1983 | static inline bool folio_needs_cow_for_dma(struct vm_area_struct *vma, |
1984 | struct folio *folio) | |
0b90ddae | 1985 | { |
623a1ddf | 1986 | VM_BUG_ON(!(raw_read_seqcount(&vma->vm_mm->write_protect_seq) & 1)); |
0b90ddae MWO |
1987 | |
1988 | if (!test_bit(MMF_HAS_PINNED, &vma->vm_mm->flags)) | |
1989 | return false; | |
1990 | ||
ebe2e35e DH |
1991 | return folio_maybe_dma_pinned(folio); |
1992 | } | |
1993 | ||
c8070b78 DH |
1994 | /** |
1995 | * is_zero_page - Query if a page is a zero page | |
1996 | * @page: The page to query | |
1997 | * | |
1998 | * This returns true if @page is one of the permanent zero pages. | |
1999 | */ | |
2000 | static inline bool is_zero_page(const struct page *page) | |
2001 | { | |
2002 | return is_zero_pfn(page_to_pfn(page)); | |
2003 | } | |
2004 | ||
2005 | /** | |
2006 | * is_zero_folio - Query if a folio is a zero page | |
2007 | * @folio: The folio to query | |
2008 | * | |
2009 | * This returns true if @folio is one of the permanent zero pages. | |
2010 | */ | |
2011 | static inline bool is_zero_folio(const struct folio *folio) | |
2012 | { | |
2013 | return is_zero_page(&folio->page); | |
2014 | } | |
2015 | ||
5d949953 | 2016 | /* MIGRATE_CMA and ZONE_MOVABLE do not allow pin folios */ |
8e3560d9 | 2017 | #ifdef CONFIG_MIGRATION |
5d949953 | 2018 | static inline bool folio_is_longterm_pinnable(struct folio *folio) |
8e3560d9 | 2019 | { |
1c563432 | 2020 | #ifdef CONFIG_CMA |
5d949953 | 2021 | int mt = folio_migratetype(folio); |
1c563432 MK |
2022 | |
2023 | if (mt == MIGRATE_CMA || mt == MIGRATE_ISOLATE) | |
2024 | return false; | |
2025 | #endif | |
c8070b78 | 2026 | /* The zero page can be "pinned" but gets special handling. */ |
6e17c6de | 2027 | if (is_zero_folio(folio)) |
fcab34b4 AW |
2028 | return true; |
2029 | ||
2030 | /* Coherent device memory must always allow eviction. */ | |
5d949953 | 2031 | if (folio_is_device_coherent(folio)) |
fcab34b4 AW |
2032 | return false; |
2033 | ||
5d949953 VMO |
2034 | /* Otherwise, non-movable zone folios can be pinned. */ |
2035 | return !folio_is_zone_movable(folio); | |
2036 | ||
8e3560d9 PT |
2037 | } |
2038 | #else | |
5d949953 | 2039 | static inline bool folio_is_longterm_pinnable(struct folio *folio) |
8e3560d9 PT |
2040 | { |
2041 | return true; | |
2042 | } | |
2043 | #endif | |
2044 | ||
2f1b6248 | 2045 | static inline void set_page_zone(struct page *page, enum zone_type zone) |
348f8b6c DH |
2046 | { |
2047 | page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT); | |
2048 | page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT; | |
2049 | } | |
2f1b6248 | 2050 | |
348f8b6c DH |
2051 | static inline void set_page_node(struct page *page, unsigned long node) |
2052 | { | |
2053 | page->flags &= ~(NODES_MASK << NODES_PGSHIFT); | |
2054 | page->flags |= (node & NODES_MASK) << NODES_PGSHIFT; | |
1da177e4 | 2055 | } |
89689ae7 | 2056 | |
2f1b6248 | 2057 | static inline void set_page_links(struct page *page, enum zone_type zone, |
d41dee36 | 2058 | unsigned long node, unsigned long pfn) |
1da177e4 | 2059 | { |
348f8b6c DH |
2060 | set_page_zone(page, zone); |
2061 | set_page_node(page, node); | |
9127ab4f | 2062 | #ifdef SECTION_IN_PAGE_FLAGS |
d41dee36 | 2063 | set_page_section(page, pfn_to_section_nr(pfn)); |
bf4e8902 | 2064 | #endif |
1da177e4 LT |
2065 | } |
2066 | ||
7b230db3 MWO |
2067 | /** |
2068 | * folio_nr_pages - The number of pages in the folio. | |
2069 | * @folio: The folio. | |
2070 | * | |
2071 | * Return: A positive power of two. | |
2072 | */ | |
b84fd283 | 2073 | static inline long folio_nr_pages(const struct folio *folio) |
7b230db3 | 2074 | { |
c3a15bff MWO |
2075 | if (!folio_test_large(folio)) |
2076 | return 1; | |
2077 | #ifdef CONFIG_64BIT | |
2078 | return folio->_folio_nr_pages; | |
2079 | #else | |
ebc1baf5 | 2080 | return 1L << (folio->_flags_1 & 0xff); |
c3a15bff | 2081 | #endif |
7b230db3 MWO |
2082 | } |
2083 | ||
fae7d834 MWO |
2084 | /* Only hugetlbfs can allocate folios larger than MAX_ORDER */ |
2085 | #ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE | |
2086 | #define MAX_FOLIO_NR_PAGES (1UL << PUD_ORDER) | |
2087 | #else | |
2088 | #define MAX_FOLIO_NR_PAGES MAX_ORDER_NR_PAGES | |
2089 | #endif | |
2090 | ||
21a000fe MWO |
2091 | /* |
2092 | * compound_nr() returns the number of pages in this potentially compound | |
2093 | * page. compound_nr() can be called on a tail page, and is defined to | |
2094 | * return 1 in that case. | |
2095 | */ | |
2096 | static inline unsigned long compound_nr(struct page *page) | |
2097 | { | |
2098 | struct folio *folio = (struct folio *)page; | |
2099 | ||
2100 | if (!test_bit(PG_head, &folio->flags)) | |
2101 | return 1; | |
2102 | #ifdef CONFIG_64BIT | |
2103 | return folio->_folio_nr_pages; | |
2104 | #else | |
ebc1baf5 | 2105 | return 1L << (folio->_flags_1 & 0xff); |
21a000fe MWO |
2106 | #endif |
2107 | } | |
2108 | ||
2109 | /** | |
2110 | * thp_nr_pages - The number of regular pages in this huge page. | |
2111 | * @page: The head page of a huge page. | |
2112 | */ | |
2113 | static inline int thp_nr_pages(struct page *page) | |
2114 | { | |
2115 | return folio_nr_pages((struct folio *)page); | |
2116 | } | |
2117 | ||
7b230db3 MWO |
2118 | /** |
2119 | * folio_next - Move to the next physical folio. | |
2120 | * @folio: The folio we're currently operating on. | |
2121 | * | |
2122 | * If you have physically contiguous memory which may span more than | |
2123 | * one folio (eg a &struct bio_vec), use this function to move from one | |
2124 | * folio to the next. Do not use it if the memory is only virtually | |
2125 | * contiguous as the folios are almost certainly not adjacent to each | |
2126 | * other. This is the folio equivalent to writing ``page++``. | |
2127 | * | |
2128 | * Context: We assume that the folios are refcounted and/or locked at a | |
2129 | * higher level and do not adjust the reference counts. | |
2130 | * Return: The next struct folio. | |
2131 | */ | |
2132 | static inline struct folio *folio_next(struct folio *folio) | |
2133 | { | |
2134 | return (struct folio *)folio_page(folio, folio_nr_pages(folio)); | |
2135 | } | |
2136 | ||
2137 | /** | |
2138 | * folio_shift - The size of the memory described by this folio. | |
2139 | * @folio: The folio. | |
2140 | * | |
2141 | * A folio represents a number of bytes which is a power-of-two in size. | |
2142 | * This function tells you which power-of-two the folio is. See also | |
2143 | * folio_size() and folio_order(). | |
2144 | * | |
2145 | * Context: The caller should have a reference on the folio to prevent | |
2146 | * it from being split. It is not necessary for the folio to be locked. | |
2147 | * Return: The base-2 logarithm of the size of this folio. | |
2148 | */ | |
2149 | static inline unsigned int folio_shift(struct folio *folio) | |
2150 | { | |
2151 | return PAGE_SHIFT + folio_order(folio); | |
2152 | } | |
2153 | ||
2154 | /** | |
2155 | * folio_size - The number of bytes in a folio. | |
2156 | * @folio: The folio. | |
2157 | * | |
2158 | * Context: The caller should have a reference on the folio to prevent | |
2159 | * it from being split. It is not necessary for the folio to be locked. | |
2160 | * Return: The number of bytes in this folio. | |
2161 | */ | |
2162 | static inline size_t folio_size(struct folio *folio) | |
2163 | { | |
2164 | return PAGE_SIZE << folio_order(folio); | |
2165 | } | |
2166 | ||
fa4e3f5f | 2167 | /** |
ebb34f78 DH |
2168 | * folio_likely_mapped_shared - Estimate if the folio is mapped into the page |
2169 | * tables of more than one MM | |
fa4e3f5f VMO |
2170 | * @folio: The folio. |
2171 | * | |
ebb34f78 DH |
2172 | * This function checks if the folio is currently mapped into more than one |
2173 | * MM ("mapped shared"), or if the folio is only mapped into a single MM | |
2174 | * ("mapped exclusively"). | |
fa4e3f5f | 2175 | * |
ebb34f78 DH |
2176 | * As precise information is not easily available for all folios, this function |
2177 | * estimates the number of MMs ("sharers") that are currently mapping a folio | |
2178 | * using the number of times the first page of the folio is currently mapped | |
2179 | * into page tables. | |
2180 | * | |
2181 | * For small anonymous folios (except KSM folios) and anonymous hugetlb folios, | |
2182 | * the return value will be exactly correct, because they can only be mapped | |
2183 | * at most once into an MM, and they cannot be partially mapped. | |
2184 | * | |
2185 | * For other folios, the result can be fuzzy: | |
2186 | * #. For partially-mappable large folios (THP), the return value can wrongly | |
2187 | * indicate "mapped exclusively" (false negative) when the folio is | |
2188 | * only partially mapped into at least one MM. | |
2189 | * #. For pagecache folios (including hugetlb), the return value can wrongly | |
2190 | * indicate "mapped shared" (false positive) when two VMAs in the same MM | |
2191 | * cover the same file range. | |
2192 | * #. For (small) KSM folios, the return value can wrongly indicate "mapped | |
2193 | * shared" (false negative), when the folio is mapped multiple times into | |
2194 | * the same MM. | |
2195 | * | |
2196 | * Further, this function only considers current page table mappings that | |
2197 | * are tracked using the folio mapcount(s). | |
2198 | * | |
2199 | * This function does not consider: | |
2200 | * #. If the folio might get mapped in the (near) future (e.g., swapcache, | |
2201 | * pagecache, temporary unmapping for migration). | |
2202 | * #. If the folio is mapped differently (VM_PFNMAP). | |
2203 | * #. If hugetlb page table sharing applies. Callers might want to check | |
2204 | * hugetlb_pmd_shared(). | |
2205 | * | |
2206 | * Return: Whether the folio is estimated to be mapped into more than one MM. | |
fa4e3f5f | 2207 | */ |
ebb34f78 | 2208 | static inline bool folio_likely_mapped_shared(struct folio *folio) |
fa4e3f5f | 2209 | { |
ebb34f78 | 2210 | return page_mapcount(folio_page(folio, 0)) > 1; |
fa4e3f5f VMO |
2211 | } |
2212 | ||
b424de33 MWO |
2213 | #ifndef HAVE_ARCH_MAKE_PAGE_ACCESSIBLE |
2214 | static inline int arch_make_page_accessible(struct page *page) | |
2215 | { | |
2216 | return 0; | |
2217 | } | |
2218 | #endif | |
2219 | ||
2220 | #ifndef HAVE_ARCH_MAKE_FOLIO_ACCESSIBLE | |
2221 | static inline int arch_make_folio_accessible(struct folio *folio) | |
2222 | { | |
2223 | int ret; | |
2224 | long i, nr = folio_nr_pages(folio); | |
2225 | ||
2226 | for (i = 0; i < nr; i++) { | |
2227 | ret = arch_make_page_accessible(folio_page(folio, i)); | |
2228 | if (ret) | |
2229 | break; | |
2230 | } | |
2231 | ||
2232 | return ret; | |
2233 | } | |
2234 | #endif | |
2235 | ||
f6ac2354 CL |
2236 | /* |
2237 | * Some inline functions in vmstat.h depend on page_zone() | |
2238 | */ | |
2239 | #include <linux/vmstat.h> | |
2240 | ||
1da177e4 LT |
2241 | #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) |
2242 | #define HASHED_PAGE_VIRTUAL | |
2243 | #endif | |
2244 | ||
2245 | #if defined(WANT_PAGE_VIRTUAL) | |
f92f455f GU |
2246 | static inline void *page_address(const struct page *page) |
2247 | { | |
2248 | return page->virtual; | |
2249 | } | |
2250 | static inline void set_page_address(struct page *page, void *address) | |
2251 | { | |
2252 | page->virtual = address; | |
2253 | } | |
1da177e4 LT |
2254 | #define page_address_init() do { } while(0) |
2255 | #endif | |
2256 | ||
2257 | #if defined(HASHED_PAGE_VIRTUAL) | |
f9918794 | 2258 | void *page_address(const struct page *page); |
1da177e4 LT |
2259 | void set_page_address(struct page *page, void *virtual); |
2260 | void page_address_init(void); | |
2261 | #endif | |
2262 | ||
0871bc01 HC |
2263 | static __always_inline void *lowmem_page_address(const struct page *page) |
2264 | { | |
2265 | return page_to_virt(page); | |
2266 | } | |
2267 | ||
1da177e4 LT |
2268 | #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) |
2269 | #define page_address(page) lowmem_page_address(page) | |
2270 | #define set_page_address(page, address) do { } while(0) | |
2271 | #define page_address_init() do { } while(0) | |
2272 | #endif | |
2273 | ||
7d4203c1 VB |
2274 | static inline void *folio_address(const struct folio *folio) |
2275 | { | |
2276 | return page_address(&folio->page); | |
2277 | } | |
2278 | ||
f6ab1f7f HY |
2279 | extern pgoff_t __page_file_index(struct page *page); |
2280 | ||
1da177e4 LT |
2281 | /* |
2282 | * Return the pagecache index of the passed page. Regular pagecache pages | |
f6ab1f7f | 2283 | * use ->index whereas swapcache pages use swp_offset(->private) |
1da177e4 LT |
2284 | */ |
2285 | static inline pgoff_t page_index(struct page *page) | |
2286 | { | |
2287 | if (unlikely(PageSwapCache(page))) | |
f6ab1f7f | 2288 | return __page_file_index(page); |
1da177e4 LT |
2289 | return page->index; |
2290 | } | |
2291 | ||
2f064f34 MH |
2292 | /* |
2293 | * Return true only if the page has been allocated with | |
2294 | * ALLOC_NO_WATERMARKS and the low watermark was not | |
2295 | * met implying that the system is under some pressure. | |
2296 | */ | |
1d7bab6a | 2297 | static inline bool page_is_pfmemalloc(const struct page *page) |
2f064f34 MH |
2298 | { |
2299 | /* | |
c07aea3e MC |
2300 | * lru.next has bit 1 set if the page is allocated from the |
2301 | * pfmemalloc reserves. Callers may simply overwrite it if | |
2302 | * they do not need to preserve that information. | |
2f064f34 | 2303 | */ |
c07aea3e | 2304 | return (uintptr_t)page->lru.next & BIT(1); |
2f064f34 MH |
2305 | } |
2306 | ||
02d65d6f SK |
2307 | /* |
2308 | * Return true only if the folio has been allocated with | |
2309 | * ALLOC_NO_WATERMARKS and the low watermark was not | |
2310 | * met implying that the system is under some pressure. | |
2311 | */ | |
2312 | static inline bool folio_is_pfmemalloc(const struct folio *folio) | |
2313 | { | |
2314 | /* | |
2315 | * lru.next has bit 1 set if the page is allocated from the | |
2316 | * pfmemalloc reserves. Callers may simply overwrite it if | |
2317 | * they do not need to preserve that information. | |
2318 | */ | |
2319 | return (uintptr_t)folio->lru.next & BIT(1); | |
2320 | } | |
2321 | ||
2f064f34 MH |
2322 | /* |
2323 | * Only to be called by the page allocator on a freshly allocated | |
2324 | * page. | |
2325 | */ | |
2326 | static inline void set_page_pfmemalloc(struct page *page) | |
2327 | { | |
c07aea3e | 2328 | page->lru.next = (void *)BIT(1); |
2f064f34 MH |
2329 | } |
2330 | ||
2331 | static inline void clear_page_pfmemalloc(struct page *page) | |
2332 | { | |
c07aea3e | 2333 | page->lru.next = NULL; |
2f064f34 MH |
2334 | } |
2335 | ||
1c0fe6e3 NP |
2336 | /* |
2337 | * Can be called by the pagefault handler when it gets a VM_FAULT_OOM. | |
2338 | */ | |
2339 | extern void pagefault_out_of_memory(void); | |
2340 | ||
1da177e4 | 2341 | #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
ee6c400f | 2342 | #define offset_in_thp(page, p) ((unsigned long)(p) & (thp_size(page) - 1)) |
7b230db3 | 2343 | #define offset_in_folio(folio, p) ((unsigned long)(p) & (folio_size(folio) - 1)) |
1da177e4 | 2344 | |
21b85b09 MK |
2345 | /* |
2346 | * Parameter block passed down to zap_pte_range in exceptional cases. | |
2347 | */ | |
2348 | struct zap_details { | |
2349 | struct folio *single_folio; /* Locked folio to be unmapped */ | |
2350 | bool even_cows; /* Zap COWed private pages too? */ | |
2351 | zap_flags_t zap_flags; /* Extra flags for zapping */ | |
2352 | }; | |
2353 | ||
2354 | /* | |
2355 | * Whether to drop the pte markers, for example, the uffd-wp information for | |
2356 | * file-backed memory. This should only be specified when we will completely | |
2357 | * drop the page in the mm, either by truncation or unmapping of the vma. By | |
2358 | * default, the flag is not set. | |
2359 | */ | |
2360 | #define ZAP_FLAG_DROP_MARKER ((__force zap_flags_t) BIT(0)) | |
04ada095 MK |
2361 | /* Set in unmap_vmas() to indicate a final unmap call. Only used by hugetlb */ |
2362 | #define ZAP_FLAG_UNMAP ((__force zap_flags_t) BIT(1)) | |
21b85b09 | 2363 | |
af7f588d MD |
2364 | #ifdef CONFIG_SCHED_MM_CID |
2365 | void sched_mm_cid_before_execve(struct task_struct *t); | |
2366 | void sched_mm_cid_after_execve(struct task_struct *t); | |
2367 | void sched_mm_cid_fork(struct task_struct *t); | |
2368 | void sched_mm_cid_exit_signals(struct task_struct *t); | |
2369 | static inline int task_mm_cid(struct task_struct *t) | |
2370 | { | |
2371 | return t->mm_cid; | |
2372 | } | |
2373 | #else | |
2374 | static inline void sched_mm_cid_before_execve(struct task_struct *t) { } | |
2375 | static inline void sched_mm_cid_after_execve(struct task_struct *t) { } | |
2376 | static inline void sched_mm_cid_fork(struct task_struct *t) { } | |
2377 | static inline void sched_mm_cid_exit_signals(struct task_struct *t) { } | |
2378 | static inline int task_mm_cid(struct task_struct *t) | |
2379 | { | |
2380 | /* | |
2381 | * Use the processor id as a fall-back when the mm cid feature is | |
2382 | * disabled. This provides functional per-cpu data structure accesses | |
2383 | * in user-space, althrough it won't provide the memory usage benefits. | |
2384 | */ | |
2385 | return raw_smp_processor_id(); | |
2386 | } | |
2387 | #endif | |
2388 | ||
710ec38b | 2389 | #ifdef CONFIG_MMU |
7f43add4 | 2390 | extern bool can_do_mlock(void); |
710ec38b AB |
2391 | #else |
2392 | static inline bool can_do_mlock(void) { return false; } | |
2393 | #endif | |
d7c9e99a AG |
2394 | extern int user_shm_lock(size_t, struct ucounts *); |
2395 | extern void user_shm_unlock(size_t, struct ucounts *); | |
1da177e4 | 2396 | |
318e9342 VMO |
2397 | struct folio *vm_normal_folio(struct vm_area_struct *vma, unsigned long addr, |
2398 | pte_t pte); | |
25b2995a CH |
2399 | struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, |
2400 | pte_t pte); | |
65610453 KW |
2401 | struct folio *vm_normal_folio_pmd(struct vm_area_struct *vma, |
2402 | unsigned long addr, pmd_t pmd); | |
28093f9f GS |
2403 | struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr, |
2404 | pmd_t pmd); | |
7e675137 | 2405 | |
27d036e3 LR |
2406 | void zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, |
2407 | unsigned long size); | |
21b85b09 MK |
2408 | void zap_page_range_single(struct vm_area_struct *vma, unsigned long address, |
2409 | unsigned long size, struct zap_details *details); | |
e9adcfec MK |
2410 | static inline void zap_vma_pages(struct vm_area_struct *vma) |
2411 | { | |
2412 | zap_page_range_single(vma, vma->vm_start, | |
2413 | vma->vm_end - vma->vm_start, NULL); | |
2414 | } | |
fd892593 | 2415 | void unmap_vmas(struct mmu_gather *tlb, struct ma_state *mas, |
763ecb03 | 2416 | struct vm_area_struct *start_vma, unsigned long start, |
fd892593 | 2417 | unsigned long end, unsigned long tree_end, bool mm_wr_locked); |
e6473092 | 2418 | |
ac46d4f3 JG |
2419 | struct mmu_notifier_range; |
2420 | ||
42b77728 | 2421 | void free_pgd_range(struct mmu_gather *tlb, unsigned long addr, |
3bf5ee95 | 2422 | unsigned long end, unsigned long floor, unsigned long ceiling); |
c78f4636 PX |
2423 | int |
2424 | copy_page_range(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma); | |
ff5c19ed | 2425 | int follow_pte(struct mm_struct *mm, unsigned long address, |
9fd6dad1 | 2426 | pte_t **ptepp, spinlock_t **ptlp); |
28b2ee20 RR |
2427 | int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, |
2428 | void *buf, int len, int write); | |
1da177e4 | 2429 | |
7caef267 | 2430 | extern void truncate_pagecache(struct inode *inode, loff_t new); |
2c27c65e | 2431 | extern void truncate_setsize(struct inode *inode, loff_t newsize); |
90a80202 | 2432 | void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to); |
623e3db9 | 2433 | void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end); |
af7628d6 MWO |
2434 | int generic_error_remove_folio(struct address_space *mapping, |
2435 | struct folio *folio); | |
83f78668 | 2436 | |
d85a143b LT |
2437 | struct vm_area_struct *lock_mm_and_find_vma(struct mm_struct *mm, |
2438 | unsigned long address, struct pt_regs *regs); | |
2439 | ||
7ee1dd3f | 2440 | #ifdef CONFIG_MMU |
2b740303 | 2441 | extern vm_fault_t handle_mm_fault(struct vm_area_struct *vma, |
bce617ed PX |
2442 | unsigned long address, unsigned int flags, |
2443 | struct pt_regs *regs); | |
64019a2e | 2444 | extern int fixup_user_fault(struct mm_struct *mm, |
4a9e1cda DD |
2445 | unsigned long address, unsigned int fault_flags, |
2446 | bool *unlocked); | |
977fbdcd MW |
2447 | void unmap_mapping_pages(struct address_space *mapping, |
2448 | pgoff_t start, pgoff_t nr, bool even_cows); | |
2449 | void unmap_mapping_range(struct address_space *mapping, | |
2450 | loff_t const holebegin, loff_t const holelen, int even_cows); | |
7ee1dd3f | 2451 | #else |
2b740303 | 2452 | static inline vm_fault_t handle_mm_fault(struct vm_area_struct *vma, |
bce617ed PX |
2453 | unsigned long address, unsigned int flags, |
2454 | struct pt_regs *regs) | |
7ee1dd3f DH |
2455 | { |
2456 | /* should never happen if there's no MMU */ | |
2457 | BUG(); | |
2458 | return VM_FAULT_SIGBUS; | |
2459 | } | |
64019a2e | 2460 | static inline int fixup_user_fault(struct mm_struct *mm, unsigned long address, |
4a9e1cda | 2461 | unsigned int fault_flags, bool *unlocked) |
5c723ba5 PZ |
2462 | { |
2463 | /* should never happen if there's no MMU */ | |
2464 | BUG(); | |
2465 | return -EFAULT; | |
2466 | } | |
977fbdcd MW |
2467 | static inline void unmap_mapping_pages(struct address_space *mapping, |
2468 | pgoff_t start, pgoff_t nr, bool even_cows) { } | |
2469 | static inline void unmap_mapping_range(struct address_space *mapping, | |
2470 | loff_t const holebegin, loff_t const holelen, int even_cows) { } | |
7ee1dd3f | 2471 | #endif |
f33ea7f4 | 2472 | |
977fbdcd MW |
2473 | static inline void unmap_shared_mapping_range(struct address_space *mapping, |
2474 | loff_t const holebegin, loff_t const holelen) | |
2475 | { | |
2476 | unmap_mapping_range(mapping, holebegin, holelen, 0); | |
2477 | } | |
2478 | ||
ca5e8632 LS |
2479 | static inline struct vm_area_struct *vma_lookup(struct mm_struct *mm, |
2480 | unsigned long addr); | |
2481 | ||
977fbdcd MW |
2482 | extern int access_process_vm(struct task_struct *tsk, unsigned long addr, |
2483 | void *buf, int len, unsigned int gup_flags); | |
5ddd36b9 | 2484 | extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, |
6347e8d5 | 2485 | void *buf, int len, unsigned int gup_flags); |
1da177e4 | 2486 | |
64019a2e | 2487 | long get_user_pages_remote(struct mm_struct *mm, |
ca5e8632 LS |
2488 | unsigned long start, unsigned long nr_pages, |
2489 | unsigned int gup_flags, struct page **pages, | |
2490 | int *locked); | |
64019a2e | 2491 | long pin_user_pages_remote(struct mm_struct *mm, |
eddb1c22 JH |
2492 | unsigned long start, unsigned long nr_pages, |
2493 | unsigned int gup_flags, struct page **pages, | |
0b295316 | 2494 | int *locked); |
ca5e8632 | 2495 | |
6a1960b8 LS |
2496 | /* |
2497 | * Retrieves a single page alongside its VMA. Does not support FOLL_NOWAIT. | |
2498 | */ | |
ca5e8632 LS |
2499 | static inline struct page *get_user_page_vma_remote(struct mm_struct *mm, |
2500 | unsigned long addr, | |
2501 | int gup_flags, | |
2502 | struct vm_area_struct **vmap) | |
2503 | { | |
2504 | struct page *page; | |
2505 | struct vm_area_struct *vma; | |
6a1960b8 LS |
2506 | int got; |
2507 | ||
2508 | if (WARN_ON_ONCE(unlikely(gup_flags & FOLL_NOWAIT))) | |
2509 | return ERR_PTR(-EINVAL); | |
2510 | ||
2511 | got = get_user_pages_remote(mm, addr, 1, gup_flags, &page, NULL); | |
ca5e8632 LS |
2512 | |
2513 | if (got < 0) | |
2514 | return ERR_PTR(got); | |
ca5e8632 LS |
2515 | |
2516 | vma = vma_lookup(mm, addr); | |
2517 | if (WARN_ON_ONCE(!vma)) { | |
2518 | put_page(page); | |
2519 | return ERR_PTR(-EINVAL); | |
2520 | } | |
2521 | ||
2522 | *vmap = vma; | |
2523 | return page; | |
2524 | } | |
2525 | ||
c12d2da5 | 2526 | long get_user_pages(unsigned long start, unsigned long nr_pages, |
54d02069 | 2527 | unsigned int gup_flags, struct page **pages); |
eddb1c22 | 2528 | long pin_user_pages(unsigned long start, unsigned long nr_pages, |
4c630f30 | 2529 | unsigned int gup_flags, struct page **pages); |
c12d2da5 | 2530 | long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages, |
c164154f | 2531 | struct page **pages, unsigned int gup_flags); |
91429023 JH |
2532 | long pin_user_pages_unlocked(unsigned long start, unsigned long nr_pages, |
2533 | struct page **pages, unsigned int gup_flags); | |
9a4e9f3b | 2534 | |
73b0140b IW |
2535 | int get_user_pages_fast(unsigned long start, int nr_pages, |
2536 | unsigned int gup_flags, struct page **pages); | |
eddb1c22 JH |
2537 | int pin_user_pages_fast(unsigned long start, int nr_pages, |
2538 | unsigned int gup_flags, struct page **pages); | |
1101fb8f | 2539 | void folio_add_pin(struct folio *folio); |
8025e5dd | 2540 | |
79eb597c DJ |
2541 | int account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc); |
2542 | int __account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc, | |
2543 | struct task_struct *task, bool bypass_rlim); | |
2544 | ||
18022c5d | 2545 | struct kvec; |
f3e8fccd | 2546 | struct page *get_dump_page(unsigned long addr); |
1da177e4 | 2547 | |
b5e84594 MWO |
2548 | bool folio_mark_dirty(struct folio *folio); |
2549 | bool set_page_dirty(struct page *page); | |
1da177e4 | 2550 | int set_page_dirty_lock(struct page *page); |
b9ea2515 | 2551 | |
a9090253 | 2552 | int get_cmdline(struct task_struct *task, char *buffer, int buflen); |
1da177e4 | 2553 | |
b6a2fea3 OW |
2554 | extern unsigned long move_page_tables(struct vm_area_struct *vma, |
2555 | unsigned long old_addr, struct vm_area_struct *new_vma, | |
38a76013 | 2556 | unsigned long new_addr, unsigned long len, |
b1e5a3de | 2557 | bool need_rmap_locks, bool for_stack); |
58705444 PX |
2558 | |
2559 | /* | |
2560 | * Flags used by change_protection(). For now we make it a bitmap so | |
2561 | * that we can pass in multiple flags just like parameters. However | |
2562 | * for now all the callers are only use one of the flags at the same | |
2563 | * time. | |
2564 | */ | |
64fe24a3 DH |
2565 | /* |
2566 | * Whether we should manually check if we can map individual PTEs writable, | |
2567 | * because something (e.g., COW, uffd-wp) blocks that from happening for all | |
2568 | * PTEs automatically in a writable mapping. | |
2569 | */ | |
2570 | #define MM_CP_TRY_CHANGE_WRITABLE (1UL << 0) | |
58705444 PX |
2571 | /* Whether this protection change is for NUMA hints */ |
2572 | #define MM_CP_PROT_NUMA (1UL << 1) | |
292924b2 PX |
2573 | /* Whether this change is for write protecting */ |
2574 | #define MM_CP_UFFD_WP (1UL << 2) /* do wp */ | |
2575 | #define MM_CP_UFFD_WP_RESOLVE (1UL << 3) /* Resolve wp */ | |
2576 | #define MM_CP_UFFD_WP_ALL (MM_CP_UFFD_WP | \ | |
2577 | MM_CP_UFFD_WP_RESOLVE) | |
58705444 | 2578 | |
54cbbbf3 | 2579 | bool vma_needs_dirty_tracking(struct vm_area_struct *vma); |
eb309ec8 DH |
2580 | int vma_wants_writenotify(struct vm_area_struct *vma, pgprot_t vm_page_prot); |
2581 | static inline bool vma_wants_manual_pte_write_upgrade(struct vm_area_struct *vma) | |
2582 | { | |
2583 | /* | |
2584 | * We want to check manually if we can change individual PTEs writable | |
2585 | * if we can't do that automatically for all PTEs in a mapping. For | |
2586 | * private mappings, that's always the case when we have write | |
2587 | * permissions as we properly have to handle COW. | |
2588 | */ | |
2589 | if (vma->vm_flags & VM_SHARED) | |
2590 | return vma_wants_writenotify(vma, vma->vm_page_prot); | |
2591 | return !!(vma->vm_flags & VM_WRITE); | |
2592 | ||
2593 | } | |
6a56ccbc DH |
2594 | bool can_change_pte_writable(struct vm_area_struct *vma, unsigned long addr, |
2595 | pte_t pte); | |
a79390f5 | 2596 | extern long change_protection(struct mmu_gather *tlb, |
4a18419f | 2597 | struct vm_area_struct *vma, unsigned long start, |
1ef488ed | 2598 | unsigned long end, unsigned long cp_flags); |
2286a691 LH |
2599 | extern int mprotect_fixup(struct vma_iterator *vmi, struct mmu_gather *tlb, |
2600 | struct vm_area_struct *vma, struct vm_area_struct **pprev, | |
2601 | unsigned long start, unsigned long end, unsigned long newflags); | |
1da177e4 | 2602 | |
465a454f PZ |
2603 | /* |
2604 | * doesn't attempt to fault and will return short. | |
2605 | */ | |
dadbb612 SJ |
2606 | int get_user_pages_fast_only(unsigned long start, int nr_pages, |
2607 | unsigned int gup_flags, struct page **pages); | |
dadbb612 SJ |
2608 | |
2609 | static inline bool get_user_page_fast_only(unsigned long addr, | |
2610 | unsigned int gup_flags, struct page **pagep) | |
2611 | { | |
2612 | return get_user_pages_fast_only(addr, 1, gup_flags, pagep) == 1; | |
2613 | } | |
d559db08 KH |
2614 | /* |
2615 | * per-process(per-mm_struct) statistics. | |
2616 | */ | |
d559db08 KH |
2617 | static inline unsigned long get_mm_counter(struct mm_struct *mm, int member) |
2618 | { | |
f1a79412 | 2619 | return percpu_counter_read_positive(&mm->rss_stat[member]); |
69c97823 | 2620 | } |
d559db08 | 2621 | |
f1a79412 | 2622 | void mm_trace_rss_stat(struct mm_struct *mm, int member); |
b3d1411b | 2623 | |
d559db08 KH |
2624 | static inline void add_mm_counter(struct mm_struct *mm, int member, long value) |
2625 | { | |
f1a79412 | 2626 | percpu_counter_add(&mm->rss_stat[member], value); |
b3d1411b | 2627 | |
f1a79412 | 2628 | mm_trace_rss_stat(mm, member); |
d559db08 KH |
2629 | } |
2630 | ||
2631 | static inline void inc_mm_counter(struct mm_struct *mm, int member) | |
2632 | { | |
f1a79412 | 2633 | percpu_counter_inc(&mm->rss_stat[member]); |
b3d1411b | 2634 | |
f1a79412 | 2635 | mm_trace_rss_stat(mm, member); |
d559db08 KH |
2636 | } |
2637 | ||
2638 | static inline void dec_mm_counter(struct mm_struct *mm, int member) | |
2639 | { | |
f1a79412 | 2640 | percpu_counter_dec(&mm->rss_stat[member]); |
b3d1411b | 2641 | |
f1a79412 | 2642 | mm_trace_rss_stat(mm, member); |
d559db08 KH |
2643 | } |
2644 | ||
6b27cc6c KW |
2645 | /* Optimized variant when folio is already known not to be anon */ |
2646 | static inline int mm_counter_file(struct folio *folio) | |
eca56ff9 | 2647 | { |
6b27cc6c | 2648 | if (folio_test_swapbacked(folio)) |
eca56ff9 JM |
2649 | return MM_SHMEMPAGES; |
2650 | return MM_FILEPAGES; | |
2651 | } | |
2652 | ||
a23f517b | 2653 | static inline int mm_counter(struct folio *folio) |
eca56ff9 | 2654 | { |
a23f517b | 2655 | if (folio_test_anon(folio)) |
eca56ff9 | 2656 | return MM_ANONPAGES; |
6b27cc6c | 2657 | return mm_counter_file(folio); |
eca56ff9 JM |
2658 | } |
2659 | ||
d559db08 KH |
2660 | static inline unsigned long get_mm_rss(struct mm_struct *mm) |
2661 | { | |
2662 | return get_mm_counter(mm, MM_FILEPAGES) + | |
eca56ff9 JM |
2663 | get_mm_counter(mm, MM_ANONPAGES) + |
2664 | get_mm_counter(mm, MM_SHMEMPAGES); | |
d559db08 KH |
2665 | } |
2666 | ||
2667 | static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm) | |
2668 | { | |
2669 | return max(mm->hiwater_rss, get_mm_rss(mm)); | |
2670 | } | |
2671 | ||
2672 | static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) | |
2673 | { | |
2674 | return max(mm->hiwater_vm, mm->total_vm); | |
2675 | } | |
2676 | ||
2677 | static inline void update_hiwater_rss(struct mm_struct *mm) | |
2678 | { | |
2679 | unsigned long _rss = get_mm_rss(mm); | |
2680 | ||
2681 | if ((mm)->hiwater_rss < _rss) | |
2682 | (mm)->hiwater_rss = _rss; | |
2683 | } | |
2684 | ||
2685 | static inline void update_hiwater_vm(struct mm_struct *mm) | |
2686 | { | |
2687 | if (mm->hiwater_vm < mm->total_vm) | |
2688 | mm->hiwater_vm = mm->total_vm; | |
2689 | } | |
2690 | ||
695f0559 PC |
2691 | static inline void reset_mm_hiwater_rss(struct mm_struct *mm) |
2692 | { | |
2693 | mm->hiwater_rss = get_mm_rss(mm); | |
2694 | } | |
2695 | ||
d559db08 KH |
2696 | static inline void setmax_mm_hiwater_rss(unsigned long *maxrss, |
2697 | struct mm_struct *mm) | |
2698 | { | |
2699 | unsigned long hiwater_rss = get_mm_hiwater_rss(mm); | |
2700 | ||
2701 | if (*maxrss < hiwater_rss) | |
2702 | *maxrss = hiwater_rss; | |
2703 | } | |
2704 | ||
78e7c5af AK |
2705 | #ifndef CONFIG_ARCH_HAS_PTE_SPECIAL |
2706 | static inline int pte_special(pte_t pte) | |
2707 | { | |
2708 | return 0; | |
2709 | } | |
2710 | ||
2711 | static inline pte_t pte_mkspecial(pte_t pte) | |
2712 | { | |
2713 | return pte; | |
2714 | } | |
2715 | #endif | |
2716 | ||
17596731 | 2717 | #ifndef CONFIG_ARCH_HAS_PTE_DEVMAP |
3565fce3 DW |
2718 | static inline int pte_devmap(pte_t pte) |
2719 | { | |
2720 | return 0; | |
2721 | } | |
2722 | #endif | |
2723 | ||
25ca1d6c NK |
2724 | extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr, |
2725 | spinlock_t **ptl); | |
2726 | static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, | |
2727 | spinlock_t **ptl) | |
2728 | { | |
2729 | pte_t *ptep; | |
2730 | __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl)); | |
2731 | return ptep; | |
2732 | } | |
c9cfcddf | 2733 | |
c2febafc KS |
2734 | #ifdef __PAGETABLE_P4D_FOLDED |
2735 | static inline int __p4d_alloc(struct mm_struct *mm, pgd_t *pgd, | |
2736 | unsigned long address) | |
2737 | { | |
2738 | return 0; | |
2739 | } | |
2740 | #else | |
2741 | int __p4d_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address); | |
2742 | #endif | |
2743 | ||
b4e98d9a | 2744 | #if defined(__PAGETABLE_PUD_FOLDED) || !defined(CONFIG_MMU) |
c2febafc | 2745 | static inline int __pud_alloc(struct mm_struct *mm, p4d_t *p4d, |
5f22df00 NP |
2746 | unsigned long address) |
2747 | { | |
2748 | return 0; | |
2749 | } | |
b4e98d9a KS |
2750 | static inline void mm_inc_nr_puds(struct mm_struct *mm) {} |
2751 | static inline void mm_dec_nr_puds(struct mm_struct *mm) {} | |
2752 | ||
5f22df00 | 2753 | #else |
c2febafc | 2754 | int __pud_alloc(struct mm_struct *mm, p4d_t *p4d, unsigned long address); |
b4e98d9a | 2755 | |
b4e98d9a KS |
2756 | static inline void mm_inc_nr_puds(struct mm_struct *mm) |
2757 | { | |
6d212db1 MS |
2758 | if (mm_pud_folded(mm)) |
2759 | return; | |
af5b0f6a | 2760 | atomic_long_add(PTRS_PER_PUD * sizeof(pud_t), &mm->pgtables_bytes); |
b4e98d9a KS |
2761 | } |
2762 | ||
2763 | static inline void mm_dec_nr_puds(struct mm_struct *mm) | |
2764 | { | |
6d212db1 MS |
2765 | if (mm_pud_folded(mm)) |
2766 | return; | |
af5b0f6a | 2767 | atomic_long_sub(PTRS_PER_PUD * sizeof(pud_t), &mm->pgtables_bytes); |
b4e98d9a | 2768 | } |
5f22df00 NP |
2769 | #endif |
2770 | ||
2d2f5119 | 2771 | #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU) |
5f22df00 NP |
2772 | static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud, |
2773 | unsigned long address) | |
2774 | { | |
2775 | return 0; | |
2776 | } | |
dc6c9a35 | 2777 | |
dc6c9a35 KS |
2778 | static inline void mm_inc_nr_pmds(struct mm_struct *mm) {} |
2779 | static inline void mm_dec_nr_pmds(struct mm_struct *mm) {} | |
2780 | ||
5f22df00 | 2781 | #else |
1bb3630e | 2782 | int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address); |
dc6c9a35 | 2783 | |
dc6c9a35 KS |
2784 | static inline void mm_inc_nr_pmds(struct mm_struct *mm) |
2785 | { | |
6d212db1 MS |
2786 | if (mm_pmd_folded(mm)) |
2787 | return; | |
af5b0f6a | 2788 | atomic_long_add(PTRS_PER_PMD * sizeof(pmd_t), &mm->pgtables_bytes); |
dc6c9a35 KS |
2789 | } |
2790 | ||
2791 | static inline void mm_dec_nr_pmds(struct mm_struct *mm) | |
2792 | { | |
6d212db1 MS |
2793 | if (mm_pmd_folded(mm)) |
2794 | return; | |
af5b0f6a | 2795 | atomic_long_sub(PTRS_PER_PMD * sizeof(pmd_t), &mm->pgtables_bytes); |
dc6c9a35 | 2796 | } |
5f22df00 NP |
2797 | #endif |
2798 | ||
c4812909 | 2799 | #ifdef CONFIG_MMU |
af5b0f6a | 2800 | static inline void mm_pgtables_bytes_init(struct mm_struct *mm) |
c4812909 | 2801 | { |
af5b0f6a | 2802 | atomic_long_set(&mm->pgtables_bytes, 0); |
c4812909 KS |
2803 | } |
2804 | ||
af5b0f6a | 2805 | static inline unsigned long mm_pgtables_bytes(const struct mm_struct *mm) |
c4812909 | 2806 | { |
af5b0f6a | 2807 | return atomic_long_read(&mm->pgtables_bytes); |
c4812909 KS |
2808 | } |
2809 | ||
2810 | static inline void mm_inc_nr_ptes(struct mm_struct *mm) | |
2811 | { | |
af5b0f6a | 2812 | atomic_long_add(PTRS_PER_PTE * sizeof(pte_t), &mm->pgtables_bytes); |
c4812909 KS |
2813 | } |
2814 | ||
2815 | static inline void mm_dec_nr_ptes(struct mm_struct *mm) | |
2816 | { | |
af5b0f6a | 2817 | atomic_long_sub(PTRS_PER_PTE * sizeof(pte_t), &mm->pgtables_bytes); |
c4812909 KS |
2818 | } |
2819 | #else | |
c4812909 | 2820 | |
af5b0f6a KS |
2821 | static inline void mm_pgtables_bytes_init(struct mm_struct *mm) {} |
2822 | static inline unsigned long mm_pgtables_bytes(const struct mm_struct *mm) | |
c4812909 KS |
2823 | { |
2824 | return 0; | |
2825 | } | |
2826 | ||
2827 | static inline void mm_inc_nr_ptes(struct mm_struct *mm) {} | |
2828 | static inline void mm_dec_nr_ptes(struct mm_struct *mm) {} | |
2829 | #endif | |
2830 | ||
4cf58924 JFG |
2831 | int __pte_alloc(struct mm_struct *mm, pmd_t *pmd); |
2832 | int __pte_alloc_kernel(pmd_t *pmd); | |
1bb3630e | 2833 | |
f949286c MR |
2834 | #if defined(CONFIG_MMU) |
2835 | ||
c2febafc KS |
2836 | static inline p4d_t *p4d_alloc(struct mm_struct *mm, pgd_t *pgd, |
2837 | unsigned long address) | |
2838 | { | |
2839 | return (unlikely(pgd_none(*pgd)) && __p4d_alloc(mm, pgd, address)) ? | |
2840 | NULL : p4d_offset(pgd, address); | |
2841 | } | |
2842 | ||
2843 | static inline pud_t *pud_alloc(struct mm_struct *mm, p4d_t *p4d, | |
2844 | unsigned long address) | |
1da177e4 | 2845 | { |
c2febafc KS |
2846 | return (unlikely(p4d_none(*p4d)) && __pud_alloc(mm, p4d, address)) ? |
2847 | NULL : pud_offset(p4d, address); | |
1da177e4 | 2848 | } |
d8626138 | 2849 | |
1da177e4 LT |
2850 | static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) |
2851 | { | |
1bb3630e HD |
2852 | return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))? |
2853 | NULL: pmd_offset(pud, address); | |
1da177e4 | 2854 | } |
f949286c | 2855 | #endif /* CONFIG_MMU */ |
1bb3630e | 2856 | |
bf2d4334 VMO |
2857 | static inline struct ptdesc *virt_to_ptdesc(const void *x) |
2858 | { | |
2859 | return page_ptdesc(virt_to_page(x)); | |
2860 | } | |
2861 | ||
2862 | static inline void *ptdesc_to_virt(const struct ptdesc *pt) | |
2863 | { | |
2864 | return page_to_virt(ptdesc_page(pt)); | |
2865 | } | |
2866 | ||
2867 | static inline void *ptdesc_address(const struct ptdesc *pt) | |
2868 | { | |
2869 | return folio_address(ptdesc_folio(pt)); | |
2870 | } | |
2871 | ||
2872 | static inline bool pagetable_is_reserved(struct ptdesc *pt) | |
2873 | { | |
2874 | return folio_test_reserved(ptdesc_folio(pt)); | |
2875 | } | |
2876 | ||
2877 | /** | |
2878 | * pagetable_alloc - Allocate pagetables | |
2879 | * @gfp: GFP flags | |
2880 | * @order: desired pagetable order | |
2881 | * | |
2882 | * pagetable_alloc allocates memory for page tables as well as a page table | |
2883 | * descriptor to describe that memory. | |
2884 | * | |
2885 | * Return: The ptdesc describing the allocated page tables. | |
2886 | */ | |
2c321f3f | 2887 | static inline struct ptdesc *pagetable_alloc_noprof(gfp_t gfp, unsigned int order) |
bf2d4334 | 2888 | { |
2c321f3f | 2889 | struct page *page = alloc_pages_noprof(gfp | __GFP_COMP, order); |
bf2d4334 VMO |
2890 | |
2891 | return page_ptdesc(page); | |
2892 | } | |
2c321f3f | 2893 | #define pagetable_alloc(...) alloc_hooks(pagetable_alloc_noprof(__VA_ARGS__)) |
bf2d4334 VMO |
2894 | |
2895 | /** | |
2896 | * pagetable_free - Free pagetables | |
2897 | * @pt: The page table descriptor | |
2898 | * | |
2899 | * pagetable_free frees the memory of all page tables described by a page | |
2900 | * table descriptor and the memory for the descriptor itself. | |
2901 | */ | |
2902 | static inline void pagetable_free(struct ptdesc *pt) | |
2903 | { | |
2904 | struct page *page = ptdesc_page(pt); | |
2905 | ||
2906 | __free_pages(page, compound_order(page)); | |
2907 | } | |
2908 | ||
57c1ffce | 2909 | #if USE_SPLIT_PTE_PTLOCKS |
597d795a | 2910 | #if ALLOC_SPLIT_PTLOCKS |
b35f1819 | 2911 | void __init ptlock_cache_init(void); |
f5ecca06 | 2912 | bool ptlock_alloc(struct ptdesc *ptdesc); |
6ed1b8a0 | 2913 | void ptlock_free(struct ptdesc *ptdesc); |
539edb58 | 2914 | |
1865484a | 2915 | static inline spinlock_t *ptlock_ptr(struct ptdesc *ptdesc) |
539edb58 | 2916 | { |
1865484a | 2917 | return ptdesc->ptl; |
539edb58 | 2918 | } |
597d795a | 2919 | #else /* ALLOC_SPLIT_PTLOCKS */ |
b35f1819 KS |
2920 | static inline void ptlock_cache_init(void) |
2921 | { | |
2922 | } | |
2923 | ||
f5ecca06 | 2924 | static inline bool ptlock_alloc(struct ptdesc *ptdesc) |
49076ec2 | 2925 | { |
49076ec2 KS |
2926 | return true; |
2927 | } | |
539edb58 | 2928 | |
6ed1b8a0 | 2929 | static inline void ptlock_free(struct ptdesc *ptdesc) |
49076ec2 | 2930 | { |
49076ec2 KS |
2931 | } |
2932 | ||
1865484a | 2933 | static inline spinlock_t *ptlock_ptr(struct ptdesc *ptdesc) |
49076ec2 | 2934 | { |
1865484a | 2935 | return &ptdesc->ptl; |
49076ec2 | 2936 | } |
597d795a | 2937 | #endif /* ALLOC_SPLIT_PTLOCKS */ |
49076ec2 KS |
2938 | |
2939 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) | |
2940 | { | |
1865484a | 2941 | return ptlock_ptr(page_ptdesc(pmd_page(*pmd))); |
49076ec2 KS |
2942 | } |
2943 | ||
75b25d49 | 2944 | static inline bool ptlock_init(struct ptdesc *ptdesc) |
49076ec2 KS |
2945 | { |
2946 | /* | |
2947 | * prep_new_page() initialize page->private (and therefore page->ptl) | |
2948 | * with 0. Make sure nobody took it in use in between. | |
2949 | * | |
2950 | * It can happen if arch try to use slab for page table allocation: | |
1d798ca3 | 2951 | * slab code uses page->slab_cache, which share storage with page->ptl. |
49076ec2 | 2952 | */ |
75b25d49 VMO |
2953 | VM_BUG_ON_PAGE(*(unsigned long *)&ptdesc->ptl, ptdesc_page(ptdesc)); |
2954 | if (!ptlock_alloc(ptdesc)) | |
49076ec2 | 2955 | return false; |
75b25d49 | 2956 | spin_lock_init(ptlock_ptr(ptdesc)); |
49076ec2 KS |
2957 | return true; |
2958 | } | |
2959 | ||
57c1ffce | 2960 | #else /* !USE_SPLIT_PTE_PTLOCKS */ |
4c21e2f2 HD |
2961 | /* |
2962 | * We use mm->page_table_lock to guard all pagetable pages of the mm. | |
2963 | */ | |
49076ec2 KS |
2964 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) |
2965 | { | |
2966 | return &mm->page_table_lock; | |
2967 | } | |
b35f1819 | 2968 | static inline void ptlock_cache_init(void) {} |
75b25d49 | 2969 | static inline bool ptlock_init(struct ptdesc *ptdesc) { return true; } |
6ed1b8a0 | 2970 | static inline void ptlock_free(struct ptdesc *ptdesc) {} |
57c1ffce | 2971 | #endif /* USE_SPLIT_PTE_PTLOCKS */ |
4c21e2f2 | 2972 | |
7e11dca1 | 2973 | static inline bool pagetable_pte_ctor(struct ptdesc *ptdesc) |
2f569afd | 2974 | { |
7e11dca1 VMO |
2975 | struct folio *folio = ptdesc_folio(ptdesc); |
2976 | ||
2977 | if (!ptlock_init(ptdesc)) | |
706874e9 | 2978 | return false; |
7e11dca1 VMO |
2979 | __folio_set_pgtable(folio); |
2980 | lruvec_stat_add_folio(folio, NR_PAGETABLE); | |
706874e9 | 2981 | return true; |
2f569afd MS |
2982 | } |
2983 | ||
7e11dca1 VMO |
2984 | static inline void pagetable_pte_dtor(struct ptdesc *ptdesc) |
2985 | { | |
2986 | struct folio *folio = ptdesc_folio(ptdesc); | |
2987 | ||
2988 | ptlock_free(ptdesc); | |
2989 | __folio_clear_pgtable(folio); | |
2990 | lruvec_stat_sub_folio(folio, NR_PAGETABLE); | |
2991 | } | |
2992 | ||
0d940a9b HD |
2993 | pte_t *__pte_offset_map(pmd_t *pmd, unsigned long addr, pmd_t *pmdvalp); |
2994 | static inline pte_t *pte_offset_map(pmd_t *pmd, unsigned long addr) | |
2995 | { | |
2996 | return __pte_offset_map(pmd, addr, NULL); | |
2997 | } | |
2998 | ||
2999 | pte_t *__pte_offset_map_lock(struct mm_struct *mm, pmd_t *pmd, | |
3000 | unsigned long addr, spinlock_t **ptlp); | |
3001 | static inline pte_t *pte_offset_map_lock(struct mm_struct *mm, pmd_t *pmd, | |
3002 | unsigned long addr, spinlock_t **ptlp) | |
3003 | { | |
3004 | pte_t *pte; | |
3005 | ||
3006 | __cond_lock(*ptlp, pte = __pte_offset_map_lock(mm, pmd, addr, ptlp)); | |
3007 | return pte; | |
3008 | } | |
3009 | ||
3010 | pte_t *pte_offset_map_nolock(struct mm_struct *mm, pmd_t *pmd, | |
3011 | unsigned long addr, spinlock_t **ptlp); | |
c74df32c HD |
3012 | |
3013 | #define pte_unmap_unlock(pte, ptl) do { \ | |
3014 | spin_unlock(ptl); \ | |
3015 | pte_unmap(pte); \ | |
3016 | } while (0) | |
3017 | ||
4cf58924 | 3018 | #define pte_alloc(mm, pmd) (unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, pmd)) |
3ed3a4f0 KS |
3019 | |
3020 | #define pte_alloc_map(mm, pmd, address) \ | |
4cf58924 | 3021 | (pte_alloc(mm, pmd) ? NULL : pte_offset_map(pmd, address)) |
1bb3630e | 3022 | |
c74df32c | 3023 | #define pte_alloc_map_lock(mm, pmd, address, ptlp) \ |
4cf58924 | 3024 | (pte_alloc(mm, pmd) ? \ |
3ed3a4f0 | 3025 | NULL : pte_offset_map_lock(mm, pmd, address, ptlp)) |
c74df32c | 3026 | |
1bb3630e | 3027 | #define pte_alloc_kernel(pmd, address) \ |
4cf58924 | 3028 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd))? \ |
1bb3630e | 3029 | NULL: pte_offset_kernel(pmd, address)) |
1da177e4 | 3030 | |
e009bb30 KS |
3031 | #if USE_SPLIT_PMD_PTLOCKS |
3032 | ||
7e25de77 | 3033 | static inline struct page *pmd_pgtable_page(pmd_t *pmd) |
634391ac MS |
3034 | { |
3035 | unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1); | |
3036 | return virt_to_page((void *)((unsigned long) pmd & mask)); | |
3037 | } | |
3038 | ||
bf2d4334 VMO |
3039 | static inline struct ptdesc *pmd_ptdesc(pmd_t *pmd) |
3040 | { | |
3041 | return page_ptdesc(pmd_pgtable_page(pmd)); | |
3042 | } | |
3043 | ||
e009bb30 KS |
3044 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
3045 | { | |
1865484a | 3046 | return ptlock_ptr(pmd_ptdesc(pmd)); |
e009bb30 KS |
3047 | } |
3048 | ||
edbaefe5 | 3049 | static inline bool pmd_ptlock_init(struct ptdesc *ptdesc) |
e009bb30 | 3050 | { |
e009bb30 | 3051 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
edbaefe5 | 3052 | ptdesc->pmd_huge_pte = NULL; |
e009bb30 | 3053 | #endif |
75b25d49 | 3054 | return ptlock_init(ptdesc); |
e009bb30 KS |
3055 | } |
3056 | ||
7e5f42ae | 3057 | static inline void pmd_ptlock_free(struct ptdesc *ptdesc) |
e009bb30 KS |
3058 | { |
3059 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
7e5f42ae | 3060 | VM_BUG_ON_PAGE(ptdesc->pmd_huge_pte, ptdesc_page(ptdesc)); |
e009bb30 | 3061 | #endif |
6ed1b8a0 | 3062 | ptlock_free(ptdesc); |
e009bb30 KS |
3063 | } |
3064 | ||
f8546d84 | 3065 | #define pmd_huge_pte(mm, pmd) (pmd_ptdesc(pmd)->pmd_huge_pte) |
e009bb30 KS |
3066 | |
3067 | #else | |
3068 | ||
9a86cb7b KS |
3069 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
3070 | { | |
3071 | return &mm->page_table_lock; | |
3072 | } | |
3073 | ||
edbaefe5 | 3074 | static inline bool pmd_ptlock_init(struct ptdesc *ptdesc) { return true; } |
7e5f42ae | 3075 | static inline void pmd_ptlock_free(struct ptdesc *ptdesc) {} |
e009bb30 | 3076 | |
c389a250 | 3077 | #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte) |
9a86cb7b | 3078 | |
e009bb30 KS |
3079 | #endif |
3080 | ||
9a86cb7b KS |
3081 | static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd) |
3082 | { | |
3083 | spinlock_t *ptl = pmd_lockptr(mm, pmd); | |
3084 | spin_lock(ptl); | |
3085 | return ptl; | |
3086 | } | |
3087 | ||
7e11dca1 | 3088 | static inline bool pagetable_pmd_ctor(struct ptdesc *ptdesc) |
b2b29d6d | 3089 | { |
7e11dca1 VMO |
3090 | struct folio *folio = ptdesc_folio(ptdesc); |
3091 | ||
3092 | if (!pmd_ptlock_init(ptdesc)) | |
b2b29d6d | 3093 | return false; |
7e11dca1 VMO |
3094 | __folio_set_pgtable(folio); |
3095 | lruvec_stat_add_folio(folio, NR_PAGETABLE); | |
b2b29d6d MW |
3096 | return true; |
3097 | } | |
3098 | ||
7e11dca1 VMO |
3099 | static inline void pagetable_pmd_dtor(struct ptdesc *ptdesc) |
3100 | { | |
3101 | struct folio *folio = ptdesc_folio(ptdesc); | |
3102 | ||
3103 | pmd_ptlock_free(ptdesc); | |
3104 | __folio_clear_pgtable(folio); | |
3105 | lruvec_stat_sub_folio(folio, NR_PAGETABLE); | |
3106 | } | |
3107 | ||
a00cc7d9 MW |
3108 | /* |
3109 | * No scalability reason to split PUD locks yet, but follow the same pattern | |
3110 | * as the PMD locks to make it easier if we decide to. The VM should not be | |
3111 | * considered ready to switch to split PUD locks yet; there may be places | |
3112 | * which need to be converted from page_table_lock. | |
3113 | */ | |
3114 | static inline spinlock_t *pud_lockptr(struct mm_struct *mm, pud_t *pud) | |
3115 | { | |
3116 | return &mm->page_table_lock; | |
3117 | } | |
3118 | ||
3119 | static inline spinlock_t *pud_lock(struct mm_struct *mm, pud_t *pud) | |
3120 | { | |
3121 | spinlock_t *ptl = pud_lockptr(mm, pud); | |
3122 | ||
3123 | spin_lock(ptl); | |
3124 | return ptl; | |
3125 | } | |
62906027 | 3126 | |
55d2a0bd BW |
3127 | static inline void pagetable_pud_ctor(struct ptdesc *ptdesc) |
3128 | { | |
3129 | struct folio *folio = ptdesc_folio(ptdesc); | |
3130 | ||
3131 | __folio_set_pgtable(folio); | |
3132 | lruvec_stat_add_folio(folio, NR_PAGETABLE); | |
3133 | } | |
3134 | ||
3135 | static inline void pagetable_pud_dtor(struct ptdesc *ptdesc) | |
3136 | { | |
3137 | struct folio *folio = ptdesc_folio(ptdesc); | |
3138 | ||
3139 | __folio_clear_pgtable(folio); | |
3140 | lruvec_stat_sub_folio(folio, NR_PAGETABLE); | |
3141 | } | |
3142 | ||
a00cc7d9 | 3143 | extern void __init pagecache_init(void); |
49a7f04a DH |
3144 | extern void free_initmem(void); |
3145 | ||
69afade7 JL |
3146 | /* |
3147 | * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK) | |
3148 | * into the buddy system. The freed pages will be poisoned with pattern | |
dbe67df4 | 3149 | * "poison" if it's within range [0, UCHAR_MAX]. |
69afade7 JL |
3150 | * Return pages freed into the buddy system. |
3151 | */ | |
11199692 | 3152 | extern unsigned long free_reserved_area(void *start, void *end, |
e5cb113f | 3153 | int poison, const char *s); |
c3d5f5f0 | 3154 | |
c3d5f5f0 | 3155 | extern void adjust_managed_page_count(struct page *page, long count); |
69afade7 | 3156 | |
61167ad5 YD |
3157 | extern void reserve_bootmem_region(phys_addr_t start, |
3158 | phys_addr_t end, int nid); | |
92923ca3 | 3159 | |
69afade7 | 3160 | /* Free the reserved page into the buddy system, so it gets managed. */ |
a0cd7a7c | 3161 | static inline void free_reserved_page(struct page *page) |
69afade7 | 3162 | { |
d224eb02 SB |
3163 | if (mem_alloc_profiling_enabled()) { |
3164 | union codetag_ref *ref = get_page_tag_ref(page); | |
3165 | ||
3166 | if (ref) { | |
3167 | set_codetag_empty(ref); | |
3168 | put_page_tag_ref(ref); | |
3169 | } | |
3170 | } | |
69afade7 JL |
3171 | ClearPageReserved(page); |
3172 | init_page_count(page); | |
3173 | __free_page(page); | |
69afade7 JL |
3174 | adjust_managed_page_count(page, 1); |
3175 | } | |
a0cd7a7c | 3176 | #define free_highmem_page(page) free_reserved_page(page) |
69afade7 JL |
3177 | |
3178 | static inline void mark_page_reserved(struct page *page) | |
3179 | { | |
3180 | SetPageReserved(page); | |
3181 | adjust_managed_page_count(page, -1); | |
3182 | } | |
3183 | ||
bf2d4334 VMO |
3184 | static inline void free_reserved_ptdesc(struct ptdesc *pt) |
3185 | { | |
3186 | free_reserved_page(ptdesc_page(pt)); | |
3187 | } | |
3188 | ||
69afade7 JL |
3189 | /* |
3190 | * Default method to free all the __init memory into the buddy system. | |
dbe67df4 JL |
3191 | * The freed pages will be poisoned with pattern "poison" if it's within |
3192 | * range [0, UCHAR_MAX]. | |
3193 | * Return pages freed into the buddy system. | |
69afade7 JL |
3194 | */ |
3195 | static inline unsigned long free_initmem_default(int poison) | |
3196 | { | |
3197 | extern char __init_begin[], __init_end[]; | |
3198 | ||
11199692 | 3199 | return free_reserved_area(&__init_begin, &__init_end, |
c5a54c70 | 3200 | poison, "unused kernel image (initmem)"); |
69afade7 JL |
3201 | } |
3202 | ||
7ee3d4e8 JL |
3203 | static inline unsigned long get_num_physpages(void) |
3204 | { | |
3205 | int nid; | |
3206 | unsigned long phys_pages = 0; | |
3207 | ||
3208 | for_each_online_node(nid) | |
3209 | phys_pages += node_present_pages(nid); | |
3210 | ||
3211 | return phys_pages; | |
3212 | } | |
3213 | ||
c713216d | 3214 | /* |
3f08a302 | 3215 | * Using memblock node mappings, an architecture may initialise its |
bc9331a1 MR |
3216 | * zones, allocate the backing mem_map and account for memory holes in an |
3217 | * architecture independent manner. | |
c713216d MG |
3218 | * |
3219 | * An architecture is expected to register range of page frames backed by | |
0ee332c1 | 3220 | * physical memory with memblock_add[_node]() before calling |
9691a071 | 3221 | * free_area_init() passing in the PFN each zone ends at. At a basic |
c713216d MG |
3222 | * usage, an architecture is expected to do something like |
3223 | * | |
3224 | * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn, | |
3225 | * max_highmem_pfn}; | |
3226 | * for_each_valid_physical_page_range() | |
952eea9b | 3227 | * memblock_add_node(base, size, nid, MEMBLOCK_NONE) |
9691a071 | 3228 | * free_area_init(max_zone_pfns); |
c713216d | 3229 | */ |
9691a071 | 3230 | void free_area_init(unsigned long *max_zone_pfn); |
1e01979c | 3231 | unsigned long node_map_pfn_alignment(void); |
c713216d MG |
3232 | extern unsigned long absent_pages_in_range(unsigned long start_pfn, |
3233 | unsigned long end_pfn); | |
3234 | extern void get_pfn_range_for_nid(unsigned int nid, | |
3235 | unsigned long *start_pfn, unsigned long *end_pfn); | |
f2dbcfa7 | 3236 | |
a9ee6cf5 | 3237 | #ifndef CONFIG_NUMA |
6f24fbd3 | 3238 | static inline int early_pfn_to_nid(unsigned long pfn) |
f2dbcfa7 KH |
3239 | { |
3240 | return 0; | |
3241 | } | |
3242 | #else | |
3243 | /* please see mm/page_alloc.c */ | |
3244 | extern int __meminit early_pfn_to_nid(unsigned long pfn); | |
f2dbcfa7 KH |
3245 | #endif |
3246 | ||
1da177e4 | 3247 | extern void mem_init(void); |
8feae131 | 3248 | extern void __init mmap_init(void); |
974f4367 MH |
3249 | |
3250 | extern void __show_mem(unsigned int flags, nodemask_t *nodemask, int max_zone_idx); | |
527ed4f7 | 3251 | static inline void show_mem(void) |
974f4367 | 3252 | { |
527ed4f7 | 3253 | __show_mem(0, NULL, MAX_NR_ZONES - 1); |
974f4367 | 3254 | } |
d02bd27b | 3255 | extern long si_mem_available(void); |
1da177e4 LT |
3256 | extern void si_meminfo(struct sysinfo * val); |
3257 | extern void si_meminfo_node(struct sysinfo *val, int nid); | |
3258 | ||
a8e99259 MH |
3259 | extern __printf(3, 4) |
3260 | void warn_alloc(gfp_t gfp_mask, nodemask_t *nodemask, const char *fmt, ...); | |
a238ab5b | 3261 | |
e7c8d5c9 | 3262 | extern void setup_per_cpu_pageset(void); |
e7c8d5c9 | 3263 | |
8feae131 | 3264 | /* nommu.c */ |
33e5d769 | 3265 | extern atomic_long_t mmap_pages_allocated; |
7e660872 | 3266 | extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t); |
8feae131 | 3267 | |
6b2dbba8 | 3268 | /* interval_tree.c */ |
6b2dbba8 | 3269 | void vma_interval_tree_insert(struct vm_area_struct *node, |
f808c13f | 3270 | struct rb_root_cached *root); |
9826a516 ML |
3271 | void vma_interval_tree_insert_after(struct vm_area_struct *node, |
3272 | struct vm_area_struct *prev, | |
f808c13f | 3273 | struct rb_root_cached *root); |
6b2dbba8 | 3274 | void vma_interval_tree_remove(struct vm_area_struct *node, |
f808c13f DB |
3275 | struct rb_root_cached *root); |
3276 | struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root_cached *root, | |
6b2dbba8 ML |
3277 | unsigned long start, unsigned long last); |
3278 | struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node, | |
3279 | unsigned long start, unsigned long last); | |
3280 | ||
3281 | #define vma_interval_tree_foreach(vma, root, start, last) \ | |
3282 | for (vma = vma_interval_tree_iter_first(root, start, last); \ | |
3283 | vma; vma = vma_interval_tree_iter_next(vma, start, last)) | |
1da177e4 | 3284 | |
bf181b9f | 3285 | void anon_vma_interval_tree_insert(struct anon_vma_chain *node, |
f808c13f | 3286 | struct rb_root_cached *root); |
bf181b9f | 3287 | void anon_vma_interval_tree_remove(struct anon_vma_chain *node, |
f808c13f DB |
3288 | struct rb_root_cached *root); |
3289 | struct anon_vma_chain * | |
3290 | anon_vma_interval_tree_iter_first(struct rb_root_cached *root, | |
3291 | unsigned long start, unsigned long last); | |
bf181b9f ML |
3292 | struct anon_vma_chain *anon_vma_interval_tree_iter_next( |
3293 | struct anon_vma_chain *node, unsigned long start, unsigned long last); | |
ed8ea815 ML |
3294 | #ifdef CONFIG_DEBUG_VM_RB |
3295 | void anon_vma_interval_tree_verify(struct anon_vma_chain *node); | |
3296 | #endif | |
bf181b9f ML |
3297 | |
3298 | #define anon_vma_interval_tree_foreach(avc, root, start, last) \ | |
3299 | for (avc = anon_vma_interval_tree_iter_first(root, start, last); \ | |
3300 | avc; avc = anon_vma_interval_tree_iter_next(avc, start, last)) | |
3301 | ||
1da177e4 | 3302 | /* mmap.c */ |
34b4e4aa | 3303 | extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin); |
7c9813e8 LH |
3304 | extern int vma_expand(struct vma_iterator *vmi, struct vm_area_struct *vma, |
3305 | unsigned long start, unsigned long end, pgoff_t pgoff, | |
3306 | struct vm_area_struct *next); | |
cf51e86d LH |
3307 | extern int vma_shrink(struct vma_iterator *vmi, struct vm_area_struct *vma, |
3308 | unsigned long start, unsigned long end, pgoff_t pgoff); | |
1da177e4 | 3309 | extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *); |
1da177e4 | 3310 | extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *); |
a8fb5618 | 3311 | extern void unlink_file_vma(struct vm_area_struct *); |
1da177e4 | 3312 | extern struct vm_area_struct *copy_vma(struct vm_area_struct **, |
38a76013 ML |
3313 | unsigned long addr, unsigned long len, pgoff_t pgoff, |
3314 | bool *need_rmap_locks); | |
1da177e4 | 3315 | extern void exit_mmap(struct mm_struct *); |
94d7d923 LS |
3316 | struct vm_area_struct *vma_modify(struct vma_iterator *vmi, |
3317 | struct vm_area_struct *prev, | |
3318 | struct vm_area_struct *vma, | |
3319 | unsigned long start, unsigned long end, | |
3320 | unsigned long vm_flags, | |
3321 | struct mempolicy *policy, | |
3322 | struct vm_userfaultfd_ctx uffd_ctx, | |
3323 | struct anon_vma_name *anon_name); | |
3324 | ||
3325 | /* We are about to modify the VMA's flags. */ | |
3326 | static inline struct vm_area_struct | |
3327 | *vma_modify_flags(struct vma_iterator *vmi, | |
3328 | struct vm_area_struct *prev, | |
3329 | struct vm_area_struct *vma, | |
3330 | unsigned long start, unsigned long end, | |
3331 | unsigned long new_flags) | |
3332 | { | |
3333 | return vma_modify(vmi, prev, vma, start, end, new_flags, | |
3334 | vma_policy(vma), vma->vm_userfaultfd_ctx, | |
3335 | anon_vma_name(vma)); | |
3336 | } | |
3337 | ||
3338 | /* We are about to modify the VMA's flags and/or anon_name. */ | |
3339 | static inline struct vm_area_struct | |
3340 | *vma_modify_flags_name(struct vma_iterator *vmi, | |
3341 | struct vm_area_struct *prev, | |
3342 | struct vm_area_struct *vma, | |
3343 | unsigned long start, | |
3344 | unsigned long end, | |
3345 | unsigned long new_flags, | |
3346 | struct anon_vma_name *new_name) | |
3347 | { | |
3348 | return vma_modify(vmi, prev, vma, start, end, new_flags, | |
3349 | vma_policy(vma), vma->vm_userfaultfd_ctx, new_name); | |
3350 | } | |
3351 | ||
3352 | /* We are about to modify the VMA's memory policy. */ | |
3353 | static inline struct vm_area_struct | |
3354 | *vma_modify_policy(struct vma_iterator *vmi, | |
3355 | struct vm_area_struct *prev, | |
3356 | struct vm_area_struct *vma, | |
3357 | unsigned long start, unsigned long end, | |
3358 | struct mempolicy *new_pol) | |
3359 | { | |
3360 | return vma_modify(vmi, prev, vma, start, end, vma->vm_flags, | |
3361 | new_pol, vma->vm_userfaultfd_ctx, anon_vma_name(vma)); | |
3362 | } | |
3363 | ||
3364 | /* We are about to modify the VMA's flags and/or uffd context. */ | |
3365 | static inline struct vm_area_struct | |
3366 | *vma_modify_flags_uffd(struct vma_iterator *vmi, | |
3367 | struct vm_area_struct *prev, | |
3368 | struct vm_area_struct *vma, | |
3369 | unsigned long start, unsigned long end, | |
3370 | unsigned long new_flags, | |
3371 | struct vm_userfaultfd_ctx new_ctx) | |
3372 | { | |
3373 | return vma_modify(vmi, prev, vma, start, end, new_flags, | |
3374 | vma_policy(vma), new_ctx, anon_vma_name(vma)); | |
3375 | } | |
925d1c40 | 3376 | |
9c599024 CG |
3377 | static inline int check_data_rlimit(unsigned long rlim, |
3378 | unsigned long new, | |
3379 | unsigned long start, | |
3380 | unsigned long end_data, | |
3381 | unsigned long start_data) | |
3382 | { | |
3383 | if (rlim < RLIM_INFINITY) { | |
3384 | if (((new - start) + (end_data - start_data)) > rlim) | |
3385 | return -ENOSPC; | |
3386 | } | |
3387 | ||
3388 | return 0; | |
3389 | } | |
3390 | ||
7906d00c AA |
3391 | extern int mm_take_all_locks(struct mm_struct *mm); |
3392 | extern void mm_drop_all_locks(struct mm_struct *mm); | |
3393 | ||
fe69d560 | 3394 | extern int set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file); |
35d7bdc8 | 3395 | extern int replace_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file); |
38646013 | 3396 | extern struct file *get_mm_exe_file(struct mm_struct *mm); |
cd81a917 | 3397 | extern struct file *get_task_exe_file(struct task_struct *task); |
925d1c40 | 3398 | |
84638335 KK |
3399 | extern bool may_expand_vm(struct mm_struct *, vm_flags_t, unsigned long npages); |
3400 | extern void vm_stat_account(struct mm_struct *, vm_flags_t, long npages); | |
3401 | ||
2eefd878 DS |
3402 | extern bool vma_is_special_mapping(const struct vm_area_struct *vma, |
3403 | const struct vm_special_mapping *sm); | |
3935ed6a SS |
3404 | extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm, |
3405 | unsigned long addr, unsigned long len, | |
a62c34bd AL |
3406 | unsigned long flags, |
3407 | const struct vm_special_mapping *spec); | |
3408 | /* This is an obsolete alternative to _install_special_mapping. */ | |
fa5dc22f RM |
3409 | extern int install_special_mapping(struct mm_struct *mm, |
3410 | unsigned long addr, unsigned long len, | |
3411 | unsigned long flags, struct page **pages); | |
1da177e4 | 3412 | |
649775be | 3413 | unsigned long randomize_stack_top(unsigned long stack_top); |
5ad7dd88 | 3414 | unsigned long randomize_page(unsigned long start, unsigned long range); |
649775be | 3415 | |
8a0fe564 RE |
3416 | unsigned long |
3417 | __get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, | |
3418 | unsigned long pgoff, unsigned long flags, vm_flags_t vm_flags); | |
3419 | ||
3420 | static inline unsigned long | |
3421 | get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, | |
3422 | unsigned long pgoff, unsigned long flags) | |
3423 | { | |
3424 | return __get_unmapped_area(file, addr, len, pgoff, flags, 0); | |
3425 | } | |
1da177e4 | 3426 | |
0165ab44 | 3427 | extern unsigned long mmap_region(struct file *file, unsigned long addr, |
897ab3e0 MR |
3428 | unsigned long len, vm_flags_t vm_flags, unsigned long pgoff, |
3429 | struct list_head *uf); | |
1fcfd8db | 3430 | extern unsigned long do_mmap(struct file *file, unsigned long addr, |
bebeb3d6 | 3431 | unsigned long len, unsigned long prot, unsigned long flags, |
592b5fad YY |
3432 | vm_flags_t vm_flags, unsigned long pgoff, unsigned long *populate, |
3433 | struct list_head *uf); | |
183654ce | 3434 | extern int do_vmi_munmap(struct vma_iterator *vmi, struct mm_struct *mm, |
11f9a21a | 3435 | unsigned long start, size_t len, struct list_head *uf, |
408579cd | 3436 | bool unlock); |
897ab3e0 MR |
3437 | extern int do_munmap(struct mm_struct *, unsigned long, size_t, |
3438 | struct list_head *uf); | |
0726b01e | 3439 | extern int do_madvise(struct mm_struct *mm, unsigned long start, size_t len_in, int behavior); |
1da177e4 | 3440 | |
bebeb3d6 | 3441 | #ifdef CONFIG_MMU |
27b26701 LH |
3442 | extern int do_vma_munmap(struct vma_iterator *vmi, struct vm_area_struct *vma, |
3443 | unsigned long start, unsigned long end, | |
408579cd | 3444 | struct list_head *uf, bool unlock); |
bebeb3d6 ML |
3445 | extern int __mm_populate(unsigned long addr, unsigned long len, |
3446 | int ignore_errors); | |
3447 | static inline void mm_populate(unsigned long addr, unsigned long len) | |
3448 | { | |
3449 | /* Ignore errors */ | |
3450 | (void) __mm_populate(addr, len, 1); | |
3451 | } | |
3452 | #else | |
3453 | static inline void mm_populate(unsigned long addr, unsigned long len) {} | |
3454 | #endif | |
3455 | ||
2632bb84 | 3456 | /* This takes the mm semaphore itself */ |
16e72e9b | 3457 | extern int __must_check vm_brk_flags(unsigned long, unsigned long, unsigned long); |
bfce281c | 3458 | extern int vm_munmap(unsigned long, size_t); |
9fbeb5ab | 3459 | extern unsigned long __must_check vm_mmap(struct file *, unsigned long, |
6be5ceb0 LT |
3460 | unsigned long, unsigned long, |
3461 | unsigned long, unsigned long); | |
1da177e4 | 3462 | |
db4fbfb9 ML |
3463 | struct vm_unmapped_area_info { |
3464 | #define VM_UNMAPPED_AREA_TOPDOWN 1 | |
3465 | unsigned long flags; | |
3466 | unsigned long length; | |
3467 | unsigned long low_limit; | |
3468 | unsigned long high_limit; | |
3469 | unsigned long align_mask; | |
3470 | unsigned long align_offset; | |
3471 | }; | |
3472 | ||
baceaf1c | 3473 | extern unsigned long vm_unmapped_area(struct vm_unmapped_area_info *info); |
db4fbfb9 | 3474 | |
85821aab | 3475 | /* truncate.c */ |
1da177e4 | 3476 | extern void truncate_inode_pages(struct address_space *, loff_t); |
d7339071 HR |
3477 | extern void truncate_inode_pages_range(struct address_space *, |
3478 | loff_t lstart, loff_t lend); | |
91b0abe3 | 3479 | extern void truncate_inode_pages_final(struct address_space *); |
1da177e4 LT |
3480 | |
3481 | /* generic vm_area_ops exported for stackable file systems */ | |
2bcd6454 | 3482 | extern vm_fault_t filemap_fault(struct vm_fault *vmf); |
f9ce0be7 | 3483 | extern vm_fault_t filemap_map_pages(struct vm_fault *vmf, |
bae473a4 | 3484 | pgoff_t start_pgoff, pgoff_t end_pgoff); |
2bcd6454 | 3485 | extern vm_fault_t filemap_page_mkwrite(struct vm_fault *vmf); |
1da177e4 | 3486 | |
1be7107f | 3487 | extern unsigned long stack_guard_gap; |
d05f3169 | 3488 | /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */ |
8d7071af LT |
3489 | int expand_stack_locked(struct vm_area_struct *vma, unsigned long address); |
3490 | struct vm_area_struct *expand_stack(struct mm_struct * mm, unsigned long addr); | |
d05f3169 | 3491 | |
11192337 | 3492 | /* CONFIG_STACK_GROWSUP still needs to grow downwards at some places */ |
8d7071af | 3493 | int expand_downwards(struct vm_area_struct *vma, unsigned long address); |
1da177e4 LT |
3494 | |
3495 | /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ | |
3496 | extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr); | |
3497 | extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr, | |
3498 | struct vm_area_struct **pprev); | |
3499 | ||
abdba2dd LH |
3500 | /* |
3501 | * Look up the first VMA which intersects the interval [start_addr, end_addr) | |
3502 | * NULL if none. Assume start_addr < end_addr. | |
ce6d42f2 | 3503 | */ |
ce6d42f2 | 3504 | struct vm_area_struct *find_vma_intersection(struct mm_struct *mm, |
abdba2dd | 3505 | unsigned long start_addr, unsigned long end_addr); |
1da177e4 | 3506 | |
ce6d42f2 LH |
3507 | /** |
3508 | * vma_lookup() - Find a VMA at a specific address | |
3509 | * @mm: The process address space. | |
3510 | * @addr: The user address. | |
3511 | * | |
3512 | * Return: The vm_area_struct at the given address, %NULL otherwise. | |
3513 | */ | |
3514 | static inline | |
3515 | struct vm_area_struct *vma_lookup(struct mm_struct *mm, unsigned long addr) | |
3516 | { | |
d7c62295 | 3517 | return mtree_load(&mm->mm_mt, addr); |
ce6d42f2 LH |
3518 | } |
3519 | ||
0266e7c5 RE |
3520 | static inline unsigned long stack_guard_start_gap(struct vm_area_struct *vma) |
3521 | { | |
3522 | if (vma->vm_flags & VM_GROWSDOWN) | |
3523 | return stack_guard_gap; | |
3524 | ||
3525 | /* See reasoning around the VM_SHADOW_STACK definition */ | |
3526 | if (vma->vm_flags & VM_SHADOW_STACK) | |
3527 | return PAGE_SIZE; | |
3528 | ||
3529 | return 0; | |
3530 | } | |
3531 | ||
1be7107f HD |
3532 | static inline unsigned long vm_start_gap(struct vm_area_struct *vma) |
3533 | { | |
0266e7c5 | 3534 | unsigned long gap = stack_guard_start_gap(vma); |
1be7107f HD |
3535 | unsigned long vm_start = vma->vm_start; |
3536 | ||
0266e7c5 RE |
3537 | vm_start -= gap; |
3538 | if (vm_start > vma->vm_start) | |
3539 | vm_start = 0; | |
1be7107f HD |
3540 | return vm_start; |
3541 | } | |
3542 | ||
3543 | static inline unsigned long vm_end_gap(struct vm_area_struct *vma) | |
3544 | { | |
3545 | unsigned long vm_end = vma->vm_end; | |
3546 | ||
3547 | if (vma->vm_flags & VM_GROWSUP) { | |
3548 | vm_end += stack_guard_gap; | |
3549 | if (vm_end < vma->vm_end) | |
3550 | vm_end = -PAGE_SIZE; | |
3551 | } | |
3552 | return vm_end; | |
3553 | } | |
3554 | ||
1da177e4 LT |
3555 | static inline unsigned long vma_pages(struct vm_area_struct *vma) |
3556 | { | |
3557 | return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; | |
3558 | } | |
3559 | ||
640708a2 PE |
3560 | /* Look up the first VMA which exactly match the interval vm_start ... vm_end */ |
3561 | static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm, | |
3562 | unsigned long vm_start, unsigned long vm_end) | |
3563 | { | |
dc8635b2 | 3564 | struct vm_area_struct *vma = vma_lookup(mm, vm_start); |
640708a2 PE |
3565 | |
3566 | if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end)) | |
3567 | vma = NULL; | |
3568 | ||
3569 | return vma; | |
3570 | } | |
3571 | ||
017b1660 MK |
3572 | static inline bool range_in_vma(struct vm_area_struct *vma, |
3573 | unsigned long start, unsigned long end) | |
3574 | { | |
3575 | return (vma && vma->vm_start <= start && end <= vma->vm_end); | |
3576 | } | |
3577 | ||
bad849b3 | 3578 | #ifdef CONFIG_MMU |
804af2cf | 3579 | pgprot_t vm_get_page_prot(unsigned long vm_flags); |
64e45507 | 3580 | void vma_set_page_prot(struct vm_area_struct *vma); |
bad849b3 DH |
3581 | #else |
3582 | static inline pgprot_t vm_get_page_prot(unsigned long vm_flags) | |
3583 | { | |
3584 | return __pgprot(0); | |
3585 | } | |
64e45507 PF |
3586 | static inline void vma_set_page_prot(struct vm_area_struct *vma) |
3587 | { | |
3588 | vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); | |
3589 | } | |
bad849b3 DH |
3590 | #endif |
3591 | ||
295992fb CK |
3592 | void vma_set_file(struct vm_area_struct *vma, struct file *file); |
3593 | ||
5877231f | 3594 | #ifdef CONFIG_NUMA_BALANCING |
4b10e7d5 | 3595 | unsigned long change_prot_numa(struct vm_area_struct *vma, |
b24f53a0 LS |
3596 | unsigned long start, unsigned long end); |
3597 | #endif | |
3598 | ||
f440fa1a | 3599 | struct vm_area_struct *find_extend_vma_locked(struct mm_struct *, |
8d7071af | 3600 | unsigned long addr); |
deceb6cd HD |
3601 | int remap_pfn_range(struct vm_area_struct *, unsigned long addr, |
3602 | unsigned long pfn, unsigned long size, pgprot_t); | |
74ffa5a3 CH |
3603 | int remap_pfn_range_notrack(struct vm_area_struct *vma, unsigned long addr, |
3604 | unsigned long pfn, unsigned long size, pgprot_t prot); | |
a145dd41 | 3605 | int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *); |
8cd3984d AR |
3606 | int vm_insert_pages(struct vm_area_struct *vma, unsigned long addr, |
3607 | struct page **pages, unsigned long *num); | |
a667d745 SJ |
3608 | int vm_map_pages(struct vm_area_struct *vma, struct page **pages, |
3609 | unsigned long num); | |
3610 | int vm_map_pages_zero(struct vm_area_struct *vma, struct page **pages, | |
3611 | unsigned long num); | |
ae2b01f3 | 3612 | vm_fault_t vmf_insert_pfn(struct vm_area_struct *vma, unsigned long addr, |
e0dc0d8f | 3613 | unsigned long pfn); |
f5e6d1d5 MW |
3614 | vm_fault_t vmf_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr, |
3615 | unsigned long pfn, pgprot_t pgprot); | |
5d747637 | 3616 | vm_fault_t vmf_insert_mixed(struct vm_area_struct *vma, unsigned long addr, |
01c8f1c4 | 3617 | pfn_t pfn); |
ab77dab4 SJ |
3618 | vm_fault_t vmf_insert_mixed_mkwrite(struct vm_area_struct *vma, |
3619 | unsigned long addr, pfn_t pfn); | |
b4cbb197 LT |
3620 | int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len); |
3621 | ||
1c8f4220 SJ |
3622 | static inline vm_fault_t vmf_insert_page(struct vm_area_struct *vma, |
3623 | unsigned long addr, struct page *page) | |
3624 | { | |
3625 | int err = vm_insert_page(vma, addr, page); | |
3626 | ||
3627 | if (err == -ENOMEM) | |
3628 | return VM_FAULT_OOM; | |
3629 | if (err < 0 && err != -EBUSY) | |
3630 | return VM_FAULT_SIGBUS; | |
3631 | ||
3632 | return VM_FAULT_NOPAGE; | |
3633 | } | |
3634 | ||
f8f6ae5d JG |
3635 | #ifndef io_remap_pfn_range |
3636 | static inline int io_remap_pfn_range(struct vm_area_struct *vma, | |
3637 | unsigned long addr, unsigned long pfn, | |
3638 | unsigned long size, pgprot_t prot) | |
3639 | { | |
3640 | return remap_pfn_range(vma, addr, pfn, size, pgprot_decrypted(prot)); | |
3641 | } | |
3642 | #endif | |
3643 | ||
d97baf94 SJ |
3644 | static inline vm_fault_t vmf_error(int err) |
3645 | { | |
3646 | if (err == -ENOMEM) | |
3647 | return VM_FAULT_OOM; | |
1ea7ca1b JC |
3648 | else if (err == -EHWPOISON) |
3649 | return VM_FAULT_HWPOISON; | |
d97baf94 SJ |
3650 | return VM_FAULT_SIGBUS; |
3651 | } | |
3652 | ||
2ba39cc4 CH |
3653 | /* |
3654 | * Convert errno to return value for ->page_mkwrite() calls. | |
3655 | * | |
3656 | * This should eventually be merged with vmf_error() above, but will need a | |
3657 | * careful audit of all vmf_error() callers. | |
3658 | */ | |
3659 | static inline vm_fault_t vmf_fs_error(int err) | |
3660 | { | |
3661 | if (err == 0) | |
3662 | return VM_FAULT_LOCKED; | |
3663 | if (err == -EFAULT || err == -EAGAIN) | |
3664 | return VM_FAULT_NOPAGE; | |
3665 | if (err == -ENOMEM) | |
3666 | return VM_FAULT_OOM; | |
3667 | /* -ENOSPC, -EDQUOT, -EIO ... */ | |
3668 | return VM_FAULT_SIGBUS; | |
3669 | } | |
3670 | ||
df06b37f KB |
3671 | struct page *follow_page(struct vm_area_struct *vma, unsigned long address, |
3672 | unsigned int foll_flags); | |
240aadee | 3673 | |
2b740303 | 3674 | static inline int vm_fault_to_errno(vm_fault_t vm_fault, int foll_flags) |
9a291a7c JM |
3675 | { |
3676 | if (vm_fault & VM_FAULT_OOM) | |
3677 | return -ENOMEM; | |
3678 | if (vm_fault & (VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE)) | |
3679 | return (foll_flags & FOLL_HWPOISON) ? -EHWPOISON : -EFAULT; | |
3680 | if (vm_fault & (VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV)) | |
3681 | return -EFAULT; | |
3682 | return 0; | |
3683 | } | |
3684 | ||
474098ed DH |
3685 | /* |
3686 | * Indicates whether GUP can follow a PROT_NONE mapped page, or whether | |
3687 | * a (NUMA hinting) fault is required. | |
3688 | */ | |
d74943a2 DH |
3689 | static inline bool gup_can_follow_protnone(struct vm_area_struct *vma, |
3690 | unsigned int flags) | |
474098ed DH |
3691 | { |
3692 | /* | |
d74943a2 DH |
3693 | * If callers don't want to honor NUMA hinting faults, no need to |
3694 | * determine if we would actually have to trigger a NUMA hinting fault. | |
474098ed | 3695 | */ |
d74943a2 DH |
3696 | if (!(flags & FOLL_HONOR_NUMA_FAULT)) |
3697 | return true; | |
3698 | ||
3699 | /* | |
3700 | * NUMA hinting faults don't apply in inaccessible (PROT_NONE) VMAs. | |
3701 | * | |
3702 | * Requiring a fault here even for inaccessible VMAs would mean that | |
3703 | * FOLL_FORCE cannot make any progress, because handle_mm_fault() | |
3704 | * refuses to process NUMA hinting faults in inaccessible VMAs. | |
3705 | */ | |
3706 | return !vma_is_accessible(vma); | |
474098ed DH |
3707 | } |
3708 | ||
8b1e0f81 | 3709 | typedef int (*pte_fn_t)(pte_t *pte, unsigned long addr, void *data); |
aee16b3c JF |
3710 | extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, |
3711 | unsigned long size, pte_fn_t fn, void *data); | |
be1db475 DA |
3712 | extern int apply_to_existing_page_range(struct mm_struct *mm, |
3713 | unsigned long address, unsigned long size, | |
3714 | pte_fn_t fn, void *data); | |
aee16b3c | 3715 | |
8823b1db | 3716 | #ifdef CONFIG_PAGE_POISONING |
8db26a3d VB |
3717 | extern void __kernel_poison_pages(struct page *page, int numpages); |
3718 | extern void __kernel_unpoison_pages(struct page *page, int numpages); | |
3719 | extern bool _page_poisoning_enabled_early; | |
3720 | DECLARE_STATIC_KEY_FALSE(_page_poisoning_enabled); | |
3721 | static inline bool page_poisoning_enabled(void) | |
3722 | { | |
3723 | return _page_poisoning_enabled_early; | |
3724 | } | |
3725 | /* | |
3726 | * For use in fast paths after init_mem_debugging() has run, or when a | |
3727 | * false negative result is not harmful when called too early. | |
3728 | */ | |
3729 | static inline bool page_poisoning_enabled_static(void) | |
3730 | { | |
3731 | return static_branch_unlikely(&_page_poisoning_enabled); | |
3732 | } | |
3733 | static inline void kernel_poison_pages(struct page *page, int numpages) | |
3734 | { | |
3735 | if (page_poisoning_enabled_static()) | |
3736 | __kernel_poison_pages(page, numpages); | |
3737 | } | |
3738 | static inline void kernel_unpoison_pages(struct page *page, int numpages) | |
3739 | { | |
3740 | if (page_poisoning_enabled_static()) | |
3741 | __kernel_unpoison_pages(page, numpages); | |
3742 | } | |
8823b1db LA |
3743 | #else |
3744 | static inline bool page_poisoning_enabled(void) { return false; } | |
8db26a3d | 3745 | static inline bool page_poisoning_enabled_static(void) { return false; } |
03b6c9a3 | 3746 | static inline void __kernel_poison_pages(struct page *page, int nunmpages) { } |
8db26a3d VB |
3747 | static inline void kernel_poison_pages(struct page *page, int numpages) { } |
3748 | static inline void kernel_unpoison_pages(struct page *page, int numpages) { } | |
8823b1db LA |
3749 | #endif |
3750 | ||
51cba1eb | 3751 | DECLARE_STATIC_KEY_MAYBE(CONFIG_INIT_ON_ALLOC_DEFAULT_ON, init_on_alloc); |
6471384a AP |
3752 | static inline bool want_init_on_alloc(gfp_t flags) |
3753 | { | |
51cba1eb KC |
3754 | if (static_branch_maybe(CONFIG_INIT_ON_ALLOC_DEFAULT_ON, |
3755 | &init_on_alloc)) | |
6471384a AP |
3756 | return true; |
3757 | return flags & __GFP_ZERO; | |
3758 | } | |
3759 | ||
51cba1eb | 3760 | DECLARE_STATIC_KEY_MAYBE(CONFIG_INIT_ON_FREE_DEFAULT_ON, init_on_free); |
6471384a AP |
3761 | static inline bool want_init_on_free(void) |
3762 | { | |
51cba1eb KC |
3763 | return static_branch_maybe(CONFIG_INIT_ON_FREE_DEFAULT_ON, |
3764 | &init_on_free); | |
6471384a AP |
3765 | } |
3766 | ||
8e57f8ac VB |
3767 | extern bool _debug_pagealloc_enabled_early; |
3768 | DECLARE_STATIC_KEY_FALSE(_debug_pagealloc_enabled); | |
031bc574 JK |
3769 | |
3770 | static inline bool debug_pagealloc_enabled(void) | |
8e57f8ac VB |
3771 | { |
3772 | return IS_ENABLED(CONFIG_DEBUG_PAGEALLOC) && | |
3773 | _debug_pagealloc_enabled_early; | |
3774 | } | |
3775 | ||
3776 | /* | |
ea09800b ML |
3777 | * For use in fast paths after mem_debugging_and_hardening_init() has run, |
3778 | * or when a false negative result is not harmful when called too early. | |
8e57f8ac VB |
3779 | */ |
3780 | static inline bool debug_pagealloc_enabled_static(void) | |
031bc574 | 3781 | { |
96a2b03f VB |
3782 | if (!IS_ENABLED(CONFIG_DEBUG_PAGEALLOC)) |
3783 | return false; | |
3784 | ||
3785 | return static_branch_unlikely(&_debug_pagealloc_enabled); | |
031bc574 JK |
3786 | } |
3787 | ||
c87cbc1f | 3788 | /* |
5d6ad668 MR |
3789 | * To support DEBUG_PAGEALLOC architecture must ensure that |
3790 | * __kernel_map_pages() never fails | |
c87cbc1f | 3791 | */ |
d6332692 | 3792 | extern void __kernel_map_pages(struct page *page, int numpages, int enable); |
8f14a963 | 3793 | #ifdef CONFIG_DEBUG_PAGEALLOC |
77bc7fd6 MR |
3794 | static inline void debug_pagealloc_map_pages(struct page *page, int numpages) |
3795 | { | |
3796 | if (debug_pagealloc_enabled_static()) | |
3797 | __kernel_map_pages(page, numpages, 1); | |
3798 | } | |
3799 | ||
3800 | static inline void debug_pagealloc_unmap_pages(struct page *page, int numpages) | |
3801 | { | |
3802 | if (debug_pagealloc_enabled_static()) | |
3803 | __kernel_map_pages(page, numpages, 0); | |
3804 | } | |
884c175f KW |
3805 | |
3806 | extern unsigned int _debug_guardpage_minorder; | |
3807 | DECLARE_STATIC_KEY_FALSE(_debug_guardpage_enabled); | |
3808 | ||
3809 | static inline unsigned int debug_guardpage_minorder(void) | |
3810 | { | |
3811 | return _debug_guardpage_minorder; | |
3812 | } | |
3813 | ||
3814 | static inline bool debug_guardpage_enabled(void) | |
3815 | { | |
3816 | return static_branch_unlikely(&_debug_guardpage_enabled); | |
3817 | } | |
3818 | ||
3819 | static inline bool page_is_guard(struct page *page) | |
3820 | { | |
3821 | if (!debug_guardpage_enabled()) | |
3822 | return false; | |
3823 | ||
3824 | return PageGuard(page); | |
3825 | } | |
3826 | ||
e0932b6c | 3827 | bool __set_page_guard(struct zone *zone, struct page *page, unsigned int order); |
884c175f | 3828 | static inline bool set_page_guard(struct zone *zone, struct page *page, |
e0932b6c | 3829 | unsigned int order) |
884c175f KW |
3830 | { |
3831 | if (!debug_guardpage_enabled()) | |
3832 | return false; | |
e0932b6c | 3833 | return __set_page_guard(zone, page, order); |
884c175f KW |
3834 | } |
3835 | ||
e0932b6c | 3836 | void __clear_page_guard(struct zone *zone, struct page *page, unsigned int order); |
884c175f | 3837 | static inline void clear_page_guard(struct zone *zone, struct page *page, |
e0932b6c | 3838 | unsigned int order) |
884c175f KW |
3839 | { |
3840 | if (!debug_guardpage_enabled()) | |
3841 | return; | |
e0932b6c | 3842 | __clear_page_guard(zone, page, order); |
884c175f KW |
3843 | } |
3844 | ||
5d6ad668 | 3845 | #else /* CONFIG_DEBUG_PAGEALLOC */ |
77bc7fd6 MR |
3846 | static inline void debug_pagealloc_map_pages(struct page *page, int numpages) {} |
3847 | static inline void debug_pagealloc_unmap_pages(struct page *page, int numpages) {} | |
884c175f KW |
3848 | static inline unsigned int debug_guardpage_minorder(void) { return 0; } |
3849 | static inline bool debug_guardpage_enabled(void) { return false; } | |
3850 | static inline bool page_is_guard(struct page *page) { return false; } | |
3851 | static inline bool set_page_guard(struct zone *zone, struct page *page, | |
e0932b6c | 3852 | unsigned int order) { return false; } |
884c175f | 3853 | static inline void clear_page_guard(struct zone *zone, struct page *page, |
e0932b6c | 3854 | unsigned int order) {} |
5d6ad668 | 3855 | #endif /* CONFIG_DEBUG_PAGEALLOC */ |
1da177e4 | 3856 | |
a6c19dfe | 3857 | #ifdef __HAVE_ARCH_GATE_AREA |
31db58b3 | 3858 | extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm); |
a6c19dfe AL |
3859 | extern int in_gate_area_no_mm(unsigned long addr); |
3860 | extern int in_gate_area(struct mm_struct *mm, unsigned long addr); | |
1da177e4 | 3861 | #else |
a6c19dfe AL |
3862 | static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm) |
3863 | { | |
3864 | return NULL; | |
3865 | } | |
3866 | static inline int in_gate_area_no_mm(unsigned long addr) { return 0; } | |
3867 | static inline int in_gate_area(struct mm_struct *mm, unsigned long addr) | |
3868 | { | |
3869 | return 0; | |
3870 | } | |
1da177e4 LT |
3871 | #endif /* __HAVE_ARCH_GATE_AREA */ |
3872 | ||
44a70ade MH |
3873 | extern bool process_shares_mm(struct task_struct *p, struct mm_struct *mm); |
3874 | ||
146732ce JT |
3875 | #ifdef CONFIG_SYSCTL |
3876 | extern int sysctl_drop_caches; | |
32927393 CH |
3877 | int drop_caches_sysctl_handler(struct ctl_table *, int, void *, size_t *, |
3878 | loff_t *); | |
146732ce JT |
3879 | #endif |
3880 | ||
cb731d6c | 3881 | void drop_slab(void); |
9d0243bc | 3882 | |
7a9166e3 LY |
3883 | #ifndef CONFIG_MMU |
3884 | #define randomize_va_space 0 | |
3885 | #else | |
a62eaf15 | 3886 | extern int randomize_va_space; |
7a9166e3 | 3887 | #endif |
a62eaf15 | 3888 | |
045e72ac | 3889 | const char * arch_vma_name(struct vm_area_struct *vma); |
89165b8b | 3890 | #ifdef CONFIG_MMU |
03252919 | 3891 | void print_vma_addr(char *prefix, unsigned long rip); |
89165b8b CH |
3892 | #else |
3893 | static inline void print_vma_addr(char *prefix, unsigned long rip) | |
3894 | { | |
3895 | } | |
3896 | #endif | |
e6e5494c | 3897 | |
35fd1eb1 | 3898 | void *sparse_buffer_alloc(unsigned long size); |
e9c0a3f0 | 3899 | struct page * __populate_section_memmap(unsigned long pfn, |
e3246d8f JM |
3900 | unsigned long nr_pages, int nid, struct vmem_altmap *altmap, |
3901 | struct dev_pagemap *pgmap); | |
7b09f5af FC |
3902 | void pmd_init(void *addr); |
3903 | void pud_init(void *addr); | |
29c71111 | 3904 | pgd_t *vmemmap_pgd_populate(unsigned long addr, int node); |
c2febafc KS |
3905 | p4d_t *vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node); |
3906 | pud_t *vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node); | |
29c71111 | 3907 | pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node); |
1d9cfee7 | 3908 | pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node, |
4917f55b | 3909 | struct vmem_altmap *altmap, struct page *reuse); |
8f6aac41 | 3910 | void *vmemmap_alloc_block(unsigned long size, int node); |
4b94ffdc | 3911 | struct vmem_altmap; |
56993b4e AK |
3912 | void *vmemmap_alloc_block_buf(unsigned long size, int node, |
3913 | struct vmem_altmap *altmap); | |
8f6aac41 | 3914 | void vmemmap_verify(pte_t *, int, unsigned long, unsigned long); |
2045a3b8 FC |
3915 | void vmemmap_set_pmd(pmd_t *pmd, void *p, int node, |
3916 | unsigned long addr, unsigned long next); | |
3917 | int vmemmap_check_pmd(pmd_t *pmd, int node, | |
3918 | unsigned long addr, unsigned long next); | |
0aad818b | 3919 | int vmemmap_populate_basepages(unsigned long start, unsigned long end, |
1d9cfee7 | 3920 | int node, struct vmem_altmap *altmap); |
2045a3b8 FC |
3921 | int vmemmap_populate_hugepages(unsigned long start, unsigned long end, |
3922 | int node, struct vmem_altmap *altmap); | |
7b73d978 CH |
3923 | int vmemmap_populate(unsigned long start, unsigned long end, int node, |
3924 | struct vmem_altmap *altmap); | |
c2b91e2e | 3925 | void vmemmap_populate_print_last(void); |
0197518c | 3926 | #ifdef CONFIG_MEMORY_HOTPLUG |
24b6d416 CH |
3927 | void vmemmap_free(unsigned long start, unsigned long end, |
3928 | struct vmem_altmap *altmap); | |
0197518c | 3929 | #endif |
87a7ae75 | 3930 | |
95a2ac93 SK |
3931 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
3932 | static inline unsigned long vmem_altmap_offset(struct vmem_altmap *altmap) | |
3933 | { | |
3934 | /* number of pfns from base where pfn_to_page() is valid */ | |
3935 | if (altmap) | |
3936 | return altmap->reserve + altmap->free; | |
3937 | return 0; | |
3938 | } | |
3939 | ||
3940 | static inline void vmem_altmap_free(struct vmem_altmap *altmap, | |
3941 | unsigned long nr_pfns) | |
3942 | { | |
3943 | altmap->alloc -= nr_pfns; | |
3944 | } | |
3945 | #else | |
3946 | static inline unsigned long vmem_altmap_offset(struct vmem_altmap *altmap) | |
3947 | { | |
3948 | return 0; | |
3949 | } | |
3950 | ||
3951 | static inline void vmem_altmap_free(struct vmem_altmap *altmap, | |
3952 | unsigned long nr_pfns) | |
3953 | { | |
3954 | } | |
3955 | #endif | |
3956 | ||
c1a6c536 | 3957 | #define VMEMMAP_RESERVE_NR 2 |
0b6f1582 | 3958 | #ifdef CONFIG_ARCH_WANT_OPTIMIZE_DAX_VMEMMAP |
c1a6c536 AK |
3959 | static inline bool __vmemmap_can_optimize(struct vmem_altmap *altmap, |
3960 | struct dev_pagemap *pgmap) | |
87a7ae75 | 3961 | { |
c1a6c536 AK |
3962 | unsigned long nr_pages; |
3963 | unsigned long nr_vmemmap_pages; | |
3964 | ||
3965 | if (!pgmap || !is_power_of_2(sizeof(struct page))) | |
3966 | return false; | |
3967 | ||
3968 | nr_pages = pgmap_vmemmap_nr(pgmap); | |
3969 | nr_vmemmap_pages = ((nr_pages * sizeof(struct page)) >> PAGE_SHIFT); | |
3970 | /* | |
3971 | * For vmemmap optimization with DAX we need minimum 2 vmemmap | |
3972 | * pages. See layout diagram in Documentation/mm/vmemmap_dedup.rst | |
3973 | */ | |
3974 | return !altmap && (nr_vmemmap_pages > VMEMMAP_RESERVE_NR); | |
87a7ae75 | 3975 | } |
c1a6c536 AK |
3976 | /* |
3977 | * If we don't have an architecture override, use the generic rule | |
3978 | */ | |
3979 | #ifndef vmemmap_can_optimize | |
3980 | #define vmemmap_can_optimize __vmemmap_can_optimize | |
3981 | #endif | |
3982 | ||
87a7ae75 AK |
3983 | #else |
3984 | static inline bool vmemmap_can_optimize(struct vmem_altmap *altmap, | |
3985 | struct dev_pagemap *pgmap) | |
3986 | { | |
3987 | return false; | |
3988 | } | |
3989 | #endif | |
3990 | ||
46723bfa | 3991 | void register_page_bootmem_memmap(unsigned long section_nr, struct page *map, |
15670bfe | 3992 | unsigned long nr_pages); |
6a46079c | 3993 | |
82ba011b AK |
3994 | enum mf_flags { |
3995 | MF_COUNT_INCREASED = 1 << 0, | |
7329bbeb | 3996 | MF_ACTION_REQUIRED = 1 << 1, |
6751ed65 | 3997 | MF_MUST_KILL = 1 << 2, |
cf870c70 | 3998 | MF_SOFT_OFFLINE = 1 << 3, |
bf181c58 | 3999 | MF_UNPOISON = 1 << 4, |
67f22ba7 | 4000 | MF_SW_SIMULATED = 1 << 5, |
38f6d293 | 4001 | MF_NO_RETRY = 1 << 6, |
fa422b35 | 4002 | MF_MEM_PRE_REMOVE = 1 << 7, |
82ba011b | 4003 | }; |
c36e2024 SR |
4004 | int mf_dax_kill_procs(struct address_space *mapping, pgoff_t index, |
4005 | unsigned long count, int mf_flags); | |
83b57531 | 4006 | extern int memory_failure(unsigned long pfn, int flags); |
06202231 | 4007 | extern void memory_failure_queue_kick(int cpu); |
847ce401 | 4008 | extern int unpoison_memory(unsigned long pfn); |
d0505e9f | 4009 | extern void shake_page(struct page *p); |
5844a486 | 4010 | extern atomic_long_t num_poisoned_pages __read_mostly; |
feec24a6 | 4011 | extern int soft_offline_page(unsigned long pfn, int flags); |
405ce051 | 4012 | #ifdef CONFIG_MEMORY_FAILURE |
870388db KW |
4013 | /* |
4014 | * Sysfs entries for memory failure handling statistics. | |
4015 | */ | |
4016 | extern const struct attribute_group memory_failure_attr_group; | |
d302c239 | 4017 | extern void memory_failure_queue(unsigned long pfn, int flags); |
e591ef7d NH |
4018 | extern int __get_huge_page_for_hwpoison(unsigned long pfn, int flags, |
4019 | bool *migratable_cleared); | |
5033091d NH |
4020 | void num_poisoned_pages_inc(unsigned long pfn); |
4021 | void num_poisoned_pages_sub(unsigned long pfn, long i); | |
4248d008 | 4022 | struct task_struct *task_early_kill(struct task_struct *tsk, int force_early); |
405ce051 | 4023 | #else |
d302c239 TL |
4024 | static inline void memory_failure_queue(unsigned long pfn, int flags) |
4025 | { | |
4026 | } | |
4027 | ||
e591ef7d NH |
4028 | static inline int __get_huge_page_for_hwpoison(unsigned long pfn, int flags, |
4029 | bool *migratable_cleared) | |
405ce051 NH |
4030 | { |
4031 | return 0; | |
4032 | } | |
d027122d | 4033 | |
a46c9304 | 4034 | static inline void num_poisoned_pages_inc(unsigned long pfn) |
d027122d NH |
4035 | { |
4036 | } | |
5033091d NH |
4037 | |
4038 | static inline void num_poisoned_pages_sub(unsigned long pfn, long i) | |
4039 | { | |
4040 | } | |
4041 | #endif | |
4042 | ||
4248d008 LX |
4043 | #if defined(CONFIG_MEMORY_FAILURE) && defined(CONFIG_KSM) |
4044 | void add_to_kill_ksm(struct task_struct *tsk, struct page *p, | |
4045 | struct vm_area_struct *vma, struct list_head *to_kill, | |
4046 | unsigned long ksm_addr); | |
4047 | #endif | |
4048 | ||
5033091d NH |
4049 | #if defined(CONFIG_MEMORY_FAILURE) && defined(CONFIG_MEMORY_HOTPLUG) |
4050 | extern void memblk_nr_poison_inc(unsigned long pfn); | |
4051 | extern void memblk_nr_poison_sub(unsigned long pfn, long i); | |
4052 | #else | |
4053 | static inline void memblk_nr_poison_inc(unsigned long pfn) | |
4054 | { | |
4055 | } | |
4056 | ||
4057 | static inline void memblk_nr_poison_sub(unsigned long pfn, long i) | |
4058 | { | |
4059 | } | |
405ce051 | 4060 | #endif |
6a46079c | 4061 | |
03b122da TL |
4062 | #ifndef arch_memory_failure |
4063 | static inline int arch_memory_failure(unsigned long pfn, int flags) | |
4064 | { | |
4065 | return -ENXIO; | |
4066 | } | |
4067 | #endif | |
4068 | ||
4069 | #ifndef arch_is_platform_page | |
4070 | static inline bool arch_is_platform_page(u64 paddr) | |
4071 | { | |
4072 | return false; | |
4073 | } | |
4074 | #endif | |
cc637b17 XX |
4075 | |
4076 | /* | |
4077 | * Error handlers for various types of pages. | |
4078 | */ | |
cc3e2af4 | 4079 | enum mf_result { |
cc637b17 XX |
4080 | MF_IGNORED, /* Error: cannot be handled */ |
4081 | MF_FAILED, /* Error: handling failed */ | |
4082 | MF_DELAYED, /* Will be handled later */ | |
4083 | MF_RECOVERED, /* Successfully recovered */ | |
4084 | }; | |
4085 | ||
4086 | enum mf_action_page_type { | |
4087 | MF_MSG_KERNEL, | |
4088 | MF_MSG_KERNEL_HIGH_ORDER, | |
4089 | MF_MSG_SLAB, | |
4090 | MF_MSG_DIFFERENT_COMPOUND, | |
cc637b17 XX |
4091 | MF_MSG_HUGE, |
4092 | MF_MSG_FREE_HUGE, | |
4093 | MF_MSG_UNMAP_FAILED, | |
4094 | MF_MSG_DIRTY_SWAPCACHE, | |
4095 | MF_MSG_CLEAN_SWAPCACHE, | |
4096 | MF_MSG_DIRTY_MLOCKED_LRU, | |
4097 | MF_MSG_CLEAN_MLOCKED_LRU, | |
4098 | MF_MSG_DIRTY_UNEVICTABLE_LRU, | |
4099 | MF_MSG_CLEAN_UNEVICTABLE_LRU, | |
4100 | MF_MSG_DIRTY_LRU, | |
4101 | MF_MSG_CLEAN_LRU, | |
4102 | MF_MSG_TRUNCATED_LRU, | |
4103 | MF_MSG_BUDDY, | |
6100e34b | 4104 | MF_MSG_DAX, |
5d1fd5dc | 4105 | MF_MSG_UNSPLIT_THP, |
cc637b17 XX |
4106 | MF_MSG_UNKNOWN, |
4107 | }; | |
4108 | ||
47ad8475 AA |
4109 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS) |
4110 | extern void clear_huge_page(struct page *page, | |
c79b57e4 | 4111 | unsigned long addr_hint, |
47ad8475 | 4112 | unsigned int pages_per_huge_page); |
1cb9dc4b LS |
4113 | int copy_user_large_folio(struct folio *dst, struct folio *src, |
4114 | unsigned long addr_hint, | |
4115 | struct vm_area_struct *vma); | |
e87340ca Z |
4116 | long copy_folio_from_user(struct folio *dst_folio, |
4117 | const void __user *usr_src, | |
4118 | bool allow_pagefault); | |
2484ca9b THV |
4119 | |
4120 | /** | |
4121 | * vma_is_special_huge - Are transhuge page-table entries considered special? | |
4122 | * @vma: Pointer to the struct vm_area_struct to consider | |
4123 | * | |
4124 | * Whether transhuge page-table entries are considered "special" following | |
4125 | * the definition in vm_normal_page(). | |
4126 | * | |
4127 | * Return: true if transhuge page-table entries should be considered special, | |
4128 | * false otherwise. | |
4129 | */ | |
4130 | static inline bool vma_is_special_huge(const struct vm_area_struct *vma) | |
4131 | { | |
4132 | return vma_is_dax(vma) || (vma->vm_file && | |
4133 | (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))); | |
4134 | } | |
4135 | ||
47ad8475 AA |
4136 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ |
4137 | ||
f9872caf CS |
4138 | #if MAX_NUMNODES > 1 |
4139 | void __init setup_nr_node_ids(void); | |
4140 | #else | |
4141 | static inline void setup_nr_node_ids(void) {} | |
4142 | #endif | |
4143 | ||
010c164a SL |
4144 | extern int memcmp_pages(struct page *page1, struct page *page2); |
4145 | ||
4146 | static inline int pages_identical(struct page *page1, struct page *page2) | |
4147 | { | |
4148 | return !memcmp_pages(page1, page2); | |
4149 | } | |
4150 | ||
c5acad84 TH |
4151 | #ifdef CONFIG_MAPPING_DIRTY_HELPERS |
4152 | unsigned long clean_record_shared_mapping_range(struct address_space *mapping, | |
4153 | pgoff_t first_index, pgoff_t nr, | |
4154 | pgoff_t bitmap_pgoff, | |
4155 | unsigned long *bitmap, | |
4156 | pgoff_t *start, | |
4157 | pgoff_t *end); | |
4158 | ||
4159 | unsigned long wp_shared_mapping_range(struct address_space *mapping, | |
4160 | pgoff_t first_index, pgoff_t nr); | |
4161 | #endif | |
4162 | ||
2374c09b CH |
4163 | extern int sysctl_nr_trim_pages; |
4164 | ||
5bb1bb35 | 4165 | #ifdef CONFIG_PRINTK |
8e7f37f2 | 4166 | void mem_dump_obj(void *object); |
5bb1bb35 PM |
4167 | #else |
4168 | static inline void mem_dump_obj(void *object) {} | |
4169 | #endif | |
8e7f37f2 | 4170 | |
22247efd | 4171 | /** |
28464bbb LS |
4172 | * seal_check_write - Check for F_SEAL_WRITE or F_SEAL_FUTURE_WRITE flags and |
4173 | * handle them. | |
22247efd PX |
4174 | * @seals: the seals to check |
4175 | * @vma: the vma to operate on | |
4176 | * | |
28464bbb LS |
4177 | * Check whether F_SEAL_WRITE or F_SEAL_FUTURE_WRITE are set; if so, do proper |
4178 | * check/handling on the vma flags. Return 0 if check pass, or <0 for errors. | |
22247efd | 4179 | */ |
28464bbb | 4180 | static inline int seal_check_write(int seals, struct vm_area_struct *vma) |
22247efd | 4181 | { |
28464bbb | 4182 | if (seals & (F_SEAL_WRITE | F_SEAL_FUTURE_WRITE)) { |
22247efd PX |
4183 | /* |
4184 | * New PROT_WRITE and MAP_SHARED mmaps are not allowed when | |
28464bbb | 4185 | * write seals are active. |
22247efd PX |
4186 | */ |
4187 | if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_WRITE)) | |
4188 | return -EPERM; | |
4189 | ||
4190 | /* | |
28464bbb | 4191 | * Since an F_SEAL_[FUTURE_]WRITE sealed memfd can be mapped as |
22247efd PX |
4192 | * MAP_SHARED and read-only, take care to not allow mprotect to |
4193 | * revert protections on such mappings. Do this only for shared | |
4194 | * mappings. For private mappings, don't need to mask | |
4195 | * VM_MAYWRITE as we still want them to be COW-writable. | |
4196 | */ | |
4197 | if (vma->vm_flags & VM_SHARED) | |
1c71222e | 4198 | vm_flags_clear(vma, VM_MAYWRITE); |
22247efd PX |
4199 | } |
4200 | ||
4201 | return 0; | |
4202 | } | |
4203 | ||
9a10064f CC |
4204 | #ifdef CONFIG_ANON_VMA_NAME |
4205 | int madvise_set_anon_name(struct mm_struct *mm, unsigned long start, | |
5c26f6ac SB |
4206 | unsigned long len_in, |
4207 | struct anon_vma_name *anon_name); | |
9a10064f CC |
4208 | #else |
4209 | static inline int | |
4210 | madvise_set_anon_name(struct mm_struct *mm, unsigned long start, | |
5c26f6ac | 4211 | unsigned long len_in, struct anon_vma_name *anon_name) { |
9a10064f CC |
4212 | return 0; |
4213 | } | |
4214 | #endif | |
4215 | ||
dcdfdd40 KS |
4216 | #ifdef CONFIG_UNACCEPTED_MEMORY |
4217 | ||
4218 | bool range_contains_unaccepted_memory(phys_addr_t start, phys_addr_t end); | |
4219 | void accept_memory(phys_addr_t start, phys_addr_t end); | |
4220 | ||
4221 | #else | |
4222 | ||
4223 | static inline bool range_contains_unaccepted_memory(phys_addr_t start, | |
4224 | phys_addr_t end) | |
4225 | { | |
4226 | return false; | |
4227 | } | |
4228 | ||
4229 | static inline void accept_memory(phys_addr_t start, phys_addr_t end) | |
4230 | { | |
4231 | } | |
4232 | ||
4233 | #endif | |
4234 | ||
7cd34dd3 AH |
4235 | static inline bool pfn_is_unaccepted_memory(unsigned long pfn) |
4236 | { | |
4237 | phys_addr_t paddr = pfn << PAGE_SHIFT; | |
4238 | ||
4239 | return range_contains_unaccepted_memory(paddr, paddr + PAGE_SIZE); | |
4240 | } | |
4241 | ||
239e9a90 PX |
4242 | void vma_pgtable_walk_begin(struct vm_area_struct *vma); |
4243 | void vma_pgtable_walk_end(struct vm_area_struct *vma); | |
4244 | ||
1da177e4 | 4245 | #endif /* _LINUX_MM_H */ |